Question

2x-3y=-15
x=4y

Answer 1

You would solve this problem through substitution.
For example:
2(4y)-3y=-15
8y-3y=-15
5y=-15
y=-3

Then you would plug y=-3 back into the equation and get the x variable.

x=4(-3)
x=-12

So your coordinate/answer (depending on the problem) is (-12,-3).

Hope this helped!