Answer:
The slope of any horizontal line is 0.
Explanation:
All horizontal lines have the same slope. The slope of any horizontal line is zero.
You can remember this because lines that go up (from left to right) have positive slope. The number gets smaller as the line gets flatter. Then the horizontal line has zero slope. Then lines that go down (from left to right) have negative slope.
If you need the equation of the horizontal line through (3,-7). That is y = -7
The equation of a horizontal line is "y=anumber". In the point (x,y) the 3 is the x and the -7 is the y.
y = -7