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4x = y - 22 | dikali 2 | 8x = 2y - 44
3x = 2y - 11| diakli 1 | 3x = 2y - 11 _
5x = - 33
x = - 6,6
3x = 2y - 11
-19,8 = 2y - 11
-8,8 = 2y
-4,4= y
a = x
b = y
5a - 5b = 5(-6,6) - 5(-4,4) = - 33 + 22 = - 11
4x=y-22 ⇔y= 4x+22
kemudian di subtitusikan ke 3x-2y=-11
=3x - 2(4x+22) = -11
=3x - 8x - 44 = -11
= -5x = -11 + 44
= x= 33/-5
x= -6³/₅=a
kemudian x disubtitusikan kepersamaan 4x-y=-22
=4x - y = -22
=4(-³³/₅) - y =-22
= ⁻¹³²/₅ -y =-22
-y= -22 + (-26²/₅)
y= 22 - 26²/₅
y= -4²/₅ =b
maka 5a-5b
= 5(-6³/₅) - 5(-4²/₅)
= -33 + 22
= -11