Question

What is the X intercept of Y + 12=3(x-9)? Substitute 0 for X or y? And solve for ??? X or y?

Answer 1

`(13,0)`

Explanation:

The `x` intercept is the point in which the line intersects the `x` axis.

Every point belonging to the `x` axis has coordinates `(x,0)`, i.e. any value for the `x` coordinate, but the `y` coordinate is always zero.

And this is the key for finding it: you must set `y=0`, and solve for `x`. In this case, it means

`12=3(x-9)`

divide both sides by `3`:

`4=x-9`

add `9` to both sides:

`x=13`

So, the `x` intercept is the point `(13,0)`