Question 1126927
Point slope form requires a point and a slope:

{{{y - y1 = m(x - x1)}}}

where (x1, y1) is a point on the graph and m is the slope.

We know that x would be months and y would be amount paid.

In this scenario, we have the amount paid per month (the slope), and a point (15 months, $450).

Plug them into the equation to get:

{{{y - 450 = 20(x - 15)}}}