www.justmaths.co.uk Forming & Solving Equations (H) - Version 2 January 2016 The total volume of the cuboid is less than 900 cm3 Show that x ≤ 5 [3] 16. Here is a right-angled triangle. All measurements are in centimetres. The area of the triangle is 2.5 cm2. Find the perimeter of the triangle. Give your answer correct to 3 significant figures. The number in front of the variable should be the number 1. For example, let us solve this equation: 3 + x = 4 To solve this equation, you need to move the number 3 to the right side of the equation (remeber the „variables on one side, the numbers on the other“). When you do that, it should look like this. x = 4 – 3 Direct and literal translation of words to Math is THIS : find positive solution to equation x = + 2. To solve it, multiply both sides by x and then simplify step by step x^2 = 3 + 2x x^2 - 2x - 3 = 0 (x-3)*(x+1) = 0. The two roots are x= 3 and x= -1; but only positive x= 3 satisfies the problem's condition. ANSWER. The number is 3. Math 6/7 NOTES (6.3) Name _____ Solving Two-Step Equations (SOL 7.14). Example 1 Solve 3x + 1 = 7 CHECK. 3x + 1 = 7 Locate the variable term. 3x + 1 = 7
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