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-2x + 3y= 7
5x-2y=34
-10x + 15y=35
10x-4y=68
tambah kan
= 15y+(-4) y= 35 -68
=11y = -33
y = -33/11
y= -3
subtitusi y=-3 ke pers.1
-2x+3y=7
-2x+3(-3)=7
-2x+-9=7
-2x=7+9
-2x=16
x=16/-2
x=-8
maka :
4a-b= 4(-8)-(-3)
=-12-(-3)
=-12+3
4a-b =-9
maaf kalo salah