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3x+5y = -1. I x5 I. 15x+25y = -5
5x-6y = 16. I x3 I. 15x-18y. = -48
--------------------------------------------- -
25y-(-18y) = -5-(-48)
43y = 43
y = 1
3x+5y = -1
3x+5*1 = -1
3x= -1-5
3x = -6
x= -6/3 = -2
sehingga,
5x-y = (5*-2) - 1
-10-1 = -11
semoga bermanfaat...
teruslah berlatih...