Based on the given information, choose the abbreviation of the postulate or theorem that supports the conclusion that ΔABC ΔDEF. If the conclusion cannot be drawn from the given information, then choose "not possible".

Given:

A = D, AB = DE, BC = EF.

-2x + 7 = 7

subtract 7 from both sides.

-2x = 0

divide both sides by -2.

x = 0

check above link.

graphically?   well, you graph them both, the solutions is where they both intersect each other, since there are two solutions, meaning they will meet twice, or namely the linear will run into the quadratic curve twice, and where they meet, those x,y coordinates are the solutions to the system.