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Test Equasions, chapter 9 Solve the following equasions: x + 9 = 12 60x = -36 -x/0.2 = 3.2 x/3 + 2 = -3 - 2x/3 – ¾ = ¼ 4.8x -9 = -57 16(x-3)= -80 165 = 15(4-x) 14(x+5) = 98 x/4 = 1-x x/5 = 2(x+9) (x +4)/2 =(x+10)/3 (x-2)/4 = (15-2x)/3 (x-11)/6= (x +2)/ 7 Write the equation and solve it. I think of a number and divide it by 3, then I substract 11. The result equals -2. The sum of three consecutive numbers is 42. What are the numbers? Tim is 3 years older than Tom. Tod is twice as old as Tim. Together they are 41. How old is each boy? Find the value of x in each of the following: A solution to the equation x2 + 2x = 30 lies between 4 and 5. Find the solution correct to 1d.p. The equation x2+ x = 48 has a solution between 6 and 7. Find it correct to 2d.p. What is the difference between an equation and an identity? Explain in your own words. In which of the following equations could you replace the “=” with an “=”? 6 + 4x = x + 3 x(x-1) = -(x -x2) Prove that (x+5)2 + 3(x-1)2 = 4(x2 + x+ 7) 😊