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y=3x+1
maka
2x+3x+1=6
5x + 1 = 6
5x = 6-1=5
x=5/5=1
maka jika dimasuk2in
2x+y=6
2 x 1 + (3 x 1 +1) = 6
2 + 4 = 6
y = 6 - 2x
( 6 - 2x ) = 3x + 1 )
-2x - 3x = 1 - 6
-5x = - 5
x = 1
2(1) + y = 6
2 + y = 6
y = 6 - 2
y = 4
jadi x = 1 dan y = 4