Question

http://prntscr.com/kvgkav

Answer 1

@SmokeyBrown @Vocaloid

Answer 2

So, you'll notice that the horizontal lines cross the y-axis at 4 and -7.
So, the equation for the horizontal lines would be y=4 and y=-7
The vertical lines work the same way.
Since they cross the x-axis at -5 and 8, the equations would be x=-5 and x=8

Answer 3

so like this?
http://prntscr.com/kvgmah

Answer 4

Yep, that looks good

Answer 5

http://prntscr.com/kvgn6e

Answer 6

@SmokeyBrown

Answer 7

It's the same as the question before, see?
Two of the equations are x=0 and y=0, because the lines fall on the x and y axes.
The other two lines should just be equal to the value of x and y where the lines appear.