i need to solve it by elimination

First equation
-6x - 2y = 20
Second equation
2x - y = 0

By elimination method, we need to eliminate one of the variable.

First Elimination
I want to remove y-variable to find the value of x, so multiply the first equation by 1 and multiply the second equation by 2.
-6x - 2y = 20 (multiply 1)
 2x -  y  = 0 (multiply 2)

-6x - 2y = 20
 4x - 2y = 0
- (substract)
10x       = 20
    x       = 2

Second Elimination
I want to remove x-variable to find the value of y, so multiply the first equation by 1 and multiply the second equation by 3.
-6x - 2y = 20 (multiply 1)
 2x -  y  = 0 (multiply 3)

-6x - 2y = 20
 6x - 3y = 0
+ (add)
      -5y = 20
         y = -4

The solution is (x,y) = (2,-4)