Bantu jawab dengan cara eliminasi ya pliss

4x - 7y = 13 | ×3 | 12x -21y = 39
3x - 5y = 9 | ×4 | 12x -20y = 36
--------------------- -
-y = 3
y = -3

4x - 7y = 13
4x - 7 (-3) =13
4x +21 = 13
4x = -8
x = -2

sehingga (x,y ) = (-2, -3)