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3x-2y=2 -> 3x=2+2y -> x= (2+2y)
-x+5y=21
-((2+2y))+5y=21
-(2+2y)+15y=63
-2+(-2y)+15y=63
13y=63+2
13y=65
y=65/13
y=5
-x+5y=21
-x=21-5y
x=-21+5y ---> subtitusikan
3x-2y=2
3(-21+5y)-2y=2
-63+15y-2y=2
13y=2+63
13y=65
y=65/13
y=5 --->subtitisikan nilai y
3x-2y=2
3x-2.5=2
3x-10=2
3x=2+10
3x=12
x=12/3
x=4
Jadi x=4 dan y = 5