How do i use cramers rule to solve this equation

x-5y=-5
-4x-2y=20
i have homework that requires me to use cramers rule to solve systems of two equations, but i'm having a hard time with it. how do i solve it using cramers rule? i'm a little new to this type of math.

x - 5y = -5 .............(1)
-4x -2y = 20 .......... (2)
Simplify (2)
2x + y = -10 ..............(2)
Multiply (1) with 2
2x - 10y = -10
We reach
2x + y = 2x - 10y
+y = -10 y ............... only possible if y = 0
........
Lets check for x and put in the value of y = 0
x = -5 .............(1a)
-4x = 20 .......... (2a)
The pair confirms x = -5

The solution set = {-5, 0}