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a. y - 2x = 0
y = 2x
m = 2
b. 2y = 4x + 2 (bagi 2 kedua ruas)
y = 2x + 1
m = 2
c. x + 3y + 9 = 0
3y = -x - 9 (bagi 3 kedua ruas)
y = -1/3x - 3
m = -1/3
m = 2
b. m= -a/b = 4/2 = 2
c. m = -a/b = -1/3