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a = 1/2 , b = -2
-1/2 / -2 = 1/4 atau 0,25
2.
a) -6x + y + 8 = 0
a = -6 , b = 1
-a / b -> -(-6) / 1 = 6
m = 6
b) 2y = -3x + 10 : 2
y = -1/3x + 5
m = -1/3
c) a = 12 , b = 15
-a / b -> -12/15 = -0,8
m = -0,8