Cara subtisusi 6p-5q=40 Dan 4p-3q=26

6p-5q = 40|x2|12p-10q = 80
4p-3q = 26|x3|12p-9q   = 78
                      -----------------  --
                             q = 2
subtitusikan
4p-3q = 26
4p - 3(2) = 26
4p-6=26
4p = 26+6
4p = 32
p = 8

jadi, (p,q) = (8,2)