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2x-3y= -18 -->> dikali 2
4x-y = -16 -->> dikali 1
maka, 4x-6y = -36
dan 4x-y = -16
------------------------ - (dikurang)
maka -5y = -20
y=4
kita subtitusikan 2x-3(4) = -18
2x-12=-18
2x= -18+12
2x= -6
x= -3
jadi, 5x+ 2y= 5(-3) + 2(4) = -15+8 = -7
4x-y=-16
2x-3y=-18
12x-3y=-48
-10x=30
x=-3
2(-3)-3y=-18
y=6
5(-3)+2(6)=-3
semogabenar.