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5x-2y=4 (pers 2) ----> y = 5x/2 - 2 (pers 3)
maskn. pers3 ke pers 1
3x + 4 (5x/2 -2) =18
3x + 10x -8 = 18
13x =18+8
x =26/13
x = 2
substitusikan x ke pers 2
5x-2y=4
5.2 - 2y =4
-2y= 4-10
-2y =-6
y = 3