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x = -5/2 y + 11
-5(-5/2 y + 11) + 3y = 7
25/2 y - 55 + 3y = 7
2 x (25/2 y -55 + 3y = 7)
25 y - 110 + 6y = 14
31 y = 124
y = 4
-5x + 3y= 7 .2 -10x + 6y = 14
-31y = -124
y = -124/-31
y = 4
2x + 5y = 22
2x +5(4) =22
2x + 20 = 22
x =22-20/2
x= 1
jadi, y=4 dan x=1