I believe B . Because it seems equivalent
(2•7)-5
14-5= 9
So the answer is 9
They are also perpendicular to the top line of the roof
a) 8 -5v-3 = 5v-5
-5v+5 = 5v-5
identity
b) 3m-6 =4m+7
has 1 solution
c) 2w +4 = 5w -2w +4
2w+4 = 3w+4
w=0
one solution
d) 7y+9 = 7y-6
subtract 7y from each side
9=-6 impossible
no solution
Choice D
