How do i solve this problem?

Question

Write the equation of the line with the given slope and​ y-intercept. Undefined​ slope, (0,-9)

Answer 1

If the slope of a line is undefined, then the line is a vertical line, so it cannot be written in slope-intercept form, but it can be written in the form: x=a, where "a" is a constant.

If the line has an undefined slope and passes through the point (0,-9), then the equation of the line is x=0.

So it's just a line that's on the y-axis if you were to graph it.