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3x+2y=13
________+
8x=24
x=24/8
x=3
5*3-2y=11
15-11=2y
4/2=y
2=y
x-2y=
3-2*2=
3-4=-1(b)
3x + 2y = 13 |-2
______________
10x - 4y =22
-6x - 4y = -26
___________-
16x = 48
x = 3
subsitusi
10x - 4y = 22
10(3) - 4y = 22
-4y = 22-30
-4y = -8
y = 2
jadi,
x - 2y = 3 - 2(2)
= 3-4
= -1 (b)