{"id":162629,"date":"2025-02-15T05:16:25","date_gmt":"2025-02-15T05:16:25","guid":{"rendered":"https:\/\/news.gyankatta.org\/?p=162629"},"modified":"2025-02-20T07:16:39","modified_gmt":"2025-02-20T07:16:39","slug":"class-8-math-linear-equations-in-one-variable","status":"publish","type":"post","link":"https:\/\/news.gyankatta.org\/?p=162629","title":{"rendered":"Class 8 Math Linear Equations in One Variable Notes"},"content":{"rendered":"<h1>Linear Equations in One Variable &#8211; Class 8<\/h1>\n<p>Hi everyone! This chapter is about <span class=\"highlight\">Linear Equations in One Variable<\/span>. These are like puzzles where we need to find a missing number.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium\" src=\"https:\/\/manishchandra.org\/p6\/LinearequationssolutionsEducationInfographic.png\" alt=\"Linear Equations How many solutions\" width=\"800\" height=\"2000\" \/><\/p>\n<h2>What are Linear Equations?<\/h2>\n<p>A linear equation is an equation where the highest power of the variable (usually &#8216;x&#8217;) is 1. It&#8217;s like a straight line when you graph it (that&#8217;s why it&#8217;s called &#8220;linear&#8221;). It has an equals sign (=).<\/p>\n<div class=\"example\">\n<p>Examples: 2x + 3 = 7, 5y &#8211; 2 = 13, z\/2 + 1 = 4<\/p>\n<p>Non-Examples: x\u00b2 + 2 = 5 (x has a power of 2), 1\/x = 3 (x is in the denominator)<\/p>\n<\/div>\n<h2>Solving Linear Equations<\/h2>\n<p>Solving a linear equation means finding the value of the variable that makes the equation true. We do this by isolating the variable on one side of the equals sign.<\/p>\n<h3>Steps to Solve:<\/h3>\n<ol>\n<li><span class=\"highlight\">Simplify both sides<\/span> of the equation by combining like terms.<\/li>\n<li>Use <span class=\"highlight\">inverse operations<\/span> to move terms to the correct side. Remember:\n<ul>\n<li>To undo addition, subtract.<\/li>\n<li>To undo subtraction, add.<\/li>\n<li>To undo multiplication, divide.<\/li>\n<li>To undo division, multiply.<\/li>\n<\/ul>\n<\/li>\n<li><span class=\"highlight\">Check your answer<\/span> by plugging it back into the original equation.<\/li>\n<\/ol>\n<div class=\"example\">\n<p>Solve: 3x &#8211; 5 = 10<\/p>\n<ol>\n<li>Add 5 to both sides: 3x &#8211; 5 + 5 = 10 + 5 =&gt; 3x = 15<\/li>\n<li>Divide both sides by 3: 3x \/ 3 = 15 \/ 3 =&gt; x = 5<\/li>\n<li>Check: 3(5) &#8211; 5 = 15 &#8211; 5 = 10 (It works!)<\/li>\n<\/ol>\n<\/div>\n<h2>Applications of Linear Equations<\/h2>\n<p>Linear equations are used to solve many real-world problems. Here are some examples:<\/p>\n<div class=\"application\">\n<h3>1. Age Problems:<\/h3>\n<p>Example: Rohan is 5 years older than his brother. In 3 years, Rohan will be twice as old as his brother. How old are they now?<\/p>\n<p>Solution: Let the brother&#8217;s current age be &#8216;x&#8217;. Rohan&#8217;s current age is &#8216;x + 5&#8217;. In 3 years, the brother will be &#8216;x + 3&#8217; and Rohan will be &#8216;x + 5 + 3&#8217; or &#8216;x + 8&#8217;. The equation is: x + 8 = 2(x + 3). Solving this gives x = 2 (brother&#8217;s age). Rohan&#8217;s age is 2 + 5 = 7.<\/p>\n<\/div>\n<div class=\"application\">\n<h3>2. Word Problems (Numbers):<\/h3>\n<p>Example: The sum of two numbers is 25. One number is 7 more than the other. Find the numbers.<\/p>\n<p>Solution: Let one number be &#8216;x&#8217;. The other number is &#8216;x + 7&#8217;. The equation is: x + (x + 7) = 25. Solving this gives x = 9 (one number). The other number is 9 + 7 = 16.<\/p>\n<\/div>\n<div class=\"application\">\n<h3>3. Geometry Problems:<\/h3>\n<p>Example: The length of a rectangle is 3 times its width. If the perimeter is 48 cm, find the length and width.<\/p>\n<p>Solution: Let the width be &#8216;w&#8217;. The length is &#8216;3w&#8217;. The perimeter is 2(length + width) = 2(3w + w) = 8w. The equation is: 8w = 48. Solving this gives w = 6 (width). The length is 3 * 6 = 18.<\/p>\n<\/div>\n<p>Practice solving lots of equations, and you&#8217;ll become a pro!<\/p>\n<h1>Linear Equations Quiz &#8211; Application Problems<\/h1>\n<div class=\"question\">\n<p><strong>1. Age Problem: A father is three times as old as his son. In 12 years, the father will be twice as old as his son. How old are they now?<\/strong><\/p>\n<div class=\"answer\">Father: 36 years, Son: 12 years<\/div>\n<div class=\"explanation\">Let the son&#8217;s current age be &#8216;x&#8217;. The father&#8217;s current age is &#8216;3x&#8217;. In 12 years, the son will be &#8216;x + 12&#8217; and the father will be &#8216;3x + 12&#8217;. The equation is: 3x + 12 = 2(x + 12). Solving this gives x = 12 (son&#8217;s age). The father&#8217;s age is 3 * 12 = 36.<\/p>\n<\/div>\n<\/div>\n<div class=\"question\">\n<p>2. Number Problem: The sum of two consecutive even integers is 78. Find the integers.<\/p>\n<div class=\"answer\">38 and 40<\/div>\n<div class=\"explanation\">Let the first even integer be &#8216;x&#8217;. The next consecutive even integer is &#8216;x + 2&#8217;. The equation is: x + (x + 2) = 78. Solving this gives x = 38. The other integer is 38 + 2 = 40.<\/p>\n<\/div>\n<\/div>\n<div class=\"question\">\n<p>3. Geometry Problem: The length of a rectangle is 5 cm more than its width. If the perimeter is 38 cm, find the length and width.<\/p>\n<div class=\"answer\">Length: 12 cm, Width: 7 cm<\/div>\n<div class=\"explanation\">Let the width be &#8216;w&#8217;. The length is &#8216;w + 5&#8217;. The perimeter is 2(length + width) = 2(w + 5 + w) = 4w + 10. The equation is: 4w + 10 = 38. Solving this gives w = 7 (width). The length is 7 + 5 = 12.<\/p>\n<\/div>\n<\/div>\n<div class=\"question\">\n<p>4. Money Problem: A person has 20 notes consisting of Rs. 10 and Rs. 50 denominations. If the total amount of money is Rs. 580, how many notes of each type are there?<\/p>\n<div class=\"answer\">12 Rs. 10 notes and 8 Rs. 50 notes<\/div>\n<div class=\"explanation\">Let &#8216;x&#8217; be the number of Rs. 10 notes. Then the number of Rs. 50 notes is &#8217;20 &#8211; x&#8217;. The equation is: 10x + 50(20 &#8211; x) = 580. Solving this gives x = 12. So, there are 12 Rs. 10 notes and 20 &#8211; 12 = 8 Rs. 50 notes.<\/p>\n<\/div>\n<\/div>\n<div class=\"question\">\n<p>5. Speed Problem: A car travels at a speed of 60 km\/h for a certain time. If it had traveled at a speed of 70 km\/h, it would have covered 50 km more in the same time. Find the distance traveled by the car.<\/p>\n<div class=\"answer\">300 km<\/div>\n<div class=\"explanation\">Let &#8216;t&#8217; be the time. Distance = speed * time. Distance at 60 km\/h is 60t. Distance at 70 km\/h is 70t. The equation is: 70t = 60t + 50. Solving this gives t = 5 hours. The distance is 60 * 5 = 300 km.<\/p>\n<\/div>\n<\/div>\n<div class=\"question\">\n<p>6. Mixture Problem: A shopkeeper mixes two types of rice costing Rs. 30 per kg and Rs. 50 per kg in the ratio 2:3. If the selling price of the mixed variety is Rs. 40 per kg, find the cost price of the mixed variety.<\/p>\n<div class=\"answer\">Rs. 42 per kg<\/div>\n<div class=\"explanation\">Let the quantities of rice be 2x and 3x. Total cost = 30(2x) + 50(3x) = 60x + 150x = 210x. Total quantity = 2x + 3x = 5x. Cost price of mixture = Total cost \/ Total quantity = 210x \/ 5x = Rs. 42 per kg.<\/p>\n<\/div>\n<\/div>\n<div class=\"question\">\n<p>7. Work Problem: A can do a piece of work in 10 days and B can do it in 15 days. How many days will they take to complete the work together?<\/p>\n<div class=\"answer\">6 days<\/div>\n<div class=\"explanation\">A&#8217;s work per day = 1\/10. B&#8217;s work per day = 1\/15. Combined work per day = (1\/10) + (1\/15) = 1\/6. Number of days to complete the work together = 1 \/ (1\/6) = 6 days.<\/p>\n<\/div>\n<\/div>\n<div class=\"question\">\n<p>8. Investment Problem: A person invests a sum of Rs. 8000 partly at 5% per annum and the remaining at 6% per annum simple interest. If the total interest earned after 3 years is Rs. 1260, find the amount invested at 6% per annum.<\/p>\n<div class=\"answer\">Rs. 6000<\/div>\n<div class=\"explanation\">Let &#8216;x&#8217; be the amount invested at 5%. The amount at 6% is &#8216;8000 &#8211; x&#8217;. Simple Interest = (Principal * Rate * Time) \/ 100. The equation is: (x * 5 * 3)\/100 + ((8000 &#8211; x) * 6 * 3)\/100 = 1260. Solving this gives x = 2000. Amount at 6% is 8000 &#8211; 2000 = Rs. 6000.<\/p>\n<\/div>\n<\/div>\n<div class=\"question\">\n<p>9. Shopping Problem: Rohan bought 3 notebooks and 2 pens for Rs. 80. Each notebook costs Rs. 10 more than a pen. What is the cost of one notebook?<\/p>\n<div class=\"answer\">Rs. 20<\/div>\n<div class=\"explanation\">Let the cost of a pen be &#8216;p&#8217;. The cost of a notebook is &#8216;p + 10&#8217;. The equation is: 3(p + 10) + 2p = 80. Solving this gives p = 10 (cost of pen). Cost of notebook is 10 + 10 = Rs. 20.<\/p>\n<\/div>\n<\/div>\n<div class=\"question\">\n<p>10. Distance-Time Problem: A train travels a distance of 300 km at a uniform speed. If the speed had been 5 km\/hr more, it would have taken 2 hours less for the same journey. Find the speed of the train.<\/p>\n<div class=\"answer\">50 km\/hr<\/div>\n<div class=\"explanation\">Let the speed be &#8216;s&#8217;. Time = Distance\/Speed. Time taken at speed &#8216;s&#8217; is 300\/s. Time taken at speed &#8216;s + 5&#8217; is 300\/(s + 5). The equation is: 300\/s &#8211; 300\/(s + 5) = 2. Solving this gives s = 50 km\/hr.<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Linear Equations in One Variable &#8211; Class 8 Hi everyone! This chapter is about Linear Equations in One Variable. These are like puzzles where we need to find a missing number. What are Linear Equations? A linear equation is an equation where the highest power of the variable (usually &#8216;x&#8217;) is 1. It&#8217;s like a [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":162670,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"fifu_image_url":"https:\/\/manishchandra.org\/p6\/LinearequationssolutionsEducationInfographic.png","fifu_image_alt":"","footnotes":""},"categories":[3,23],"tags":[],"class_list":["post-162629","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-education","category-math","cat-3-id","cat-23-id","has_thumb"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Class 8 Math Linear Equations in One Variable Notes - Gyankatta<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/news.gyankatta.org\/?p=162629\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Class 8 Math Linear Equations in One Variable Notes - Gyankatta\" \/>\n<meta property=\"og:description\" content=\"Linear Equations in One Variable &#8211; Class 8 Hi everyone! 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