arora2m wrote:

If one comes across a question like this is there a trick to apply here? The only way I can think of getting an answer is by solving each equation to get the answer and seeing if it's correct or incorrect. Any tips anyone has to share here?

Q. Mary is reviewing her algebra quiz. She has determined that one of her solutions is incorrect. Which one is it?

A. 2x + 5 (x-1) = 9 x = 2

B. p - 3(p-5) = 10 p = 2.5

C. 4 y + 3 y = 28 y = 4

D. 5 w + 6 w – 3w = 64 w = 8

E. t – 2t – 3t = 32 t = 8

one quick way is that you need not solve the equation, rather substitute the value of the variable and check for the correctness, example, take A, 9x =2 , so x = 2/9;

if you substitute this value in the equation, 2*2/9+ 5( 2/9-1) = 4/9-35/9=-31/9

guess its correct