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1/4 x - 2/3 y = 5 --> sederhanakan x 12
3x - 8y = 60
persamaan 2
1/2 x + 2/3 y = -2 ---> sederhanakn x 12
6x + 8y = - 24
menggunakan eliminasi
3x - 8y = 60
6x + 8y = -24 +
9x = 36
x = 36/9
x = 4
subtitusikan
3x - 8y = 60
3(4) - 8y = 60
12 - 8y = 60
-8y = 60 - 12
-8y = 48
y = 48/-8
y = -6
nialai dari
p -4q = 4 - 4(-6)
= 4 + 24
= 28