Question

HURRY PLZ HELP AND THANKS!!!!

Answer 1

see below

Explanation:

The best strategy in cases like that is just use the proposed value in the equation and verify if it is satisfied:

(1) x = 1 satisfies:

the second equation 2(x-1)=0

(2) x = -1 satisfies:

the third equation -2x+4 = 3x+9

Answer 2

equation with a solution of x=1 is 2(x-1)=0
equation with a solution of x=-1 is -2x+4=3x+9