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x: 2y/2
x : y subtitusi
4x+5y = 18
4 (y)+5y=18
4y+5y = 18
9y = 18
y = 2
x=y
x = 2
slah ya.?
2x-2y=0. |x2| 4x-4y=0
4x+5y=18. |x1| 4x+5y=18
------------ -
y= -18
4x+5y=18
4x=18-90
4x=72
x= 8
jadi hp {8,-18}