Question

What is the slope and intercept of `x=1`?

Answer 1

Slope is: `"change in up or down"/"change in along"`

Change in along `=0` thus the slope is 'undefined'

You are 'not allowed' to divide by 0

Explanation:

The line goes through all the points where x=1
(1,-5) (1.-4) (1, 0) (1,9) etc

The line is vertical.