Answer:
18
Step-by-step explanation:
18 units
The base is 7-4 = 3 units
The height is 8 - 2 = 6 units
P = 2(b+h)
P = 2( 3+6)
P = 2(9)
P = 18
It would be constant.
Since there is no x value, the line will have no slope and just be horizontal about y= -2.
I believe it would be
i think D is your answer but i could be wrong