Question

5. Is the line with equation x = 4 horizontal or vertical? What is the slope of this line?

Answer 1

well... x = 3 is vertical so what about x = 4?

Answer 2

Horizontal.?

Answer 3

it is vertical but try graphing it first, that will help you understand

Answer 4

x = 4 only passes through the points where the x-coordinates are 4
so it could be (4,6) or (4,-27)
but regardless, it's still vertical

Answer 5

the slope or gradient of a vertical line is undefined, because nothing can be divided by 0