Question

Px+40=Qx+20

Check all that apply:
P=20 andQ=40
P=40 and Q=40
P=−20 and Q=-20
P=−40 and Q=20

Answer 1

The first answer because if you put in 20 for P and 40 for Q the equation comes out to
$20 + 40 = 40 + 20$
if you simplify you get 60 = 60 which is a true statement

if you do the other ones out and input the given numbers for P and Q they don't come out evenly and dont equal each other