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pers 2) 5x+y=7
samakan koefisien variabel y, jadi pers 2) di kali 2.
dieliminasi
10x-2y=14
3x+2y=12 +
13x = 26
x=26/13
x=2
subtitusikan x=2 ke pers 1) atau 2)
3x-2y=12
3.2-2y=12
6-2y=12
6-12=2y
-6=2y
-6/2=y
-3=y
jadi x=p=2, y=q=-3
nilai 4p+3q
= 4.2+3(-3)
=8-9
=-1