Metode substitusi 5x+3y=21 dan 4x+2y=16

4x + 2y = 16
2y = 16 - 4x
y = 8 - 2x
subtitusi ke pers. 5x + 3y = 21
5x + 3(8 - 2x) = 21
5x + 24 - 6x = 21
-x = 21 - 24
-x = -3
x = 3
y = 8 - 2x
y = 8 - 2(3)
y = 8 - 6
y = 2

Diketahui
5x + 3y = 21
4x + 2y = 16

Penyelesaian
4x + 2y = 16
        2y = 16 - 4x
          y = 16 - 4x / 2
          y = 8 - 2x

            5x + 3y = 21
5x + 3 (8 - 2x) = 21
   5x + 24 - 6x = 21
                   - x = 21 - 24
                   - x = - 3
                     x = 3

Substitusi x = 3
y = 8 - 2x
y = 8 - 2 (3)
y = 8 - 6
y = 2