If a line on a graph is horizontal, what kind of slope does it have? a.) undefined slope
b.) negative slope
c.) zero slope
d.) positive slope

The answer is a zero slope because if slope equals rise:y over run:x a horizontal line is not increasing in y value it’s only increasing in the x value so if y is 0 and x is any number like 5, it would be 0/5 and if you simplify that it would be 0. I hope this helps