3 because 6x3 +2 =20 and -3+23=20
Answer:
AC=20
Step-by-step explanation:
6y+2 = -y+23
move y to one side
7y+2=23
move 2 to the other side
7y=21
divide by 7 on both sides to isolate y
y=3
Substitute y in
-3+23=20
Check your work,18+2=20
