Question

Write an equation for the vertical line that contains point E(-12, 7). Is anybody able to help?

Answer 1

`x = -12`

Explanation:

Vertical lines take the form of
`x = something` and horizontal lines take the form of
`y = something`

Why is this? Notice that whenever you make a horizontal line on a graph and select virtually any point that's on that line, all of the points you pick will have the same y value. Try to imagine the same thing with a vertical line, are the results the same?

So the line
`x = -12` (we got -12 from the coordinate that was given to us on the question prompt) is a vertical line that passes through virtually all possible y values (from positive infinity to negative infinity, or vice-versa) which means that the question prompt having given us the y value was negligible.

Good luck!