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x + 2y - 1 = 0
2y = 1 - x dikalikan 1/2 semua ruas
jadi y = - 1x/2 + 1/2 jadi m = -1/2
b.
3x - 2y + 5 = 0
-2y = -3x - 5 dikalikan -1/2 semua ruas
jadi y = 3x/2 + 5/2 dan m = 3/2
c.
4x + y +3 = 0
y = -4x - 3 jadi m = -4
d.
2x - 4y - 11=0
-4y = -2x + 11 dikalikan -1/4 semua ruas
jadi y = 1x/2 - 11/4 maka m= 1/2