diketahui 4x+y=3 dan 3x+5y=-2. nilai x dan y adalah?

4x + y = 3 → 12x + 3y = 9
3x + 5y = -2 → 12x + 20y = -8
................ dikurangi: -17y = 17

hasilnya y = -1
→ masukkan ke rumus awal

4x + (-1) = 3
4x -1 = 3
4x = 4
x = 1

4x + y = 3 | *3 | 12x + 3y = 9
3x + 5y = -2 | *4 | 12x + 20y = -8
----------------------- -
-17y = 17
y = -1

4x +y = 3
4x +(-1) =3
4x = 3 - (-1)
4x = 4
x = 1

(x,y) = (1, -1)