For this case we have that by definition, the equation of the line in the slope-intersection form is given by:
[tex]y = mx + b[/tex]
Where:
m: It's the slope
b: It is the cut-off point with the y axis.
In addition, we have that by definition, a horizontal line has zero slope. Then the equation will be of the form:
[tex]y = b[/tex]
We substitute the "y" coordinate of the given point:
[tex](x, y) :( 9, -7)[/tex]
So:
[tex]-7 = b[/tex]
So, the equation is[tex]y = -7[/tex]
Answer:
[tex]y = -7[/tex]
