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3x+4y=7
3x + 4 y = 7 |x4| 12x + 16y =28
4x -3y = 1 |x3| 12x -9y =3
--------- -
25y=25
y= 25/25= 1
4x-3y = 1
4x-3(1)=1
4x-3=1
4x=1+3
4x=4
x=4/4 = 1
jadi {1,1}
4x-3y=1
kamu eliminasi
ntar dpu x=1 dan y=1