Question

A) What is the equation of a vertical line through the point (4, 9)?

b) What is the slope of any horizontal line?

Answer 1

a) x = 4

b) 0

Explanation:

a)

A vertical line has all x coordinates equal.

x = 4

b)

slope = (difference in y)/(difference in x)

In a horizontal line, the difference in y is always zero.

m = 0/(some number other than zero) = 0

slope = 0