Question

4. 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 E. t - 2t - 3t 32, t 8

Answer 1

E. t - 2t - 3t =32, t=8

Explanation:

A. 2x + 5 (x-1)= 9, X= 2 it's ok because

`2x+5(x-1)=9\\ 2x+5x-5=9\\ 7x=14\\ x=2`

B. p - 3(p-5)= 10, p= 2.5 it's ok as well because

`p-3(p-5)=10\\ p-3p+15=10\\ -2p=-5\\ p=(-5)/(-2) \\ p=2.5`

C. 4 y +3 y=28, y=4 also it's ok because

`4y+3y=28\\ 7y=28\\ y=(28)/(7) \\ y=4`

E. t - 2t - 3t =32, t=8 it's not ok because

`t-2t-3t=32\\-4t=32\\t=(32)/(-4) \\t=-8`

a (-) is missing!