Question

What do I do and how do I do it ?​

Answer 1

Explanation:

A line is

y=mx+b where m is the slope, however we are told that this is a horizontal line, thus the slope is zero as y does not change, With zero slope y=mx+b becomes

y=b where the constant b is the value of y. We have the point (5,-7) so b=-7 and the line is

y=-7

Answer 2

10

Explanation:

because it is