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a.) 3x + y - 4 = 0
y = -3x + 4
m = -3
maka:
y - 0 = -3(x - 0)
y = -3x + 0
y + 3x = 0
jadi persamaannya : y + 3x = 0
b.) 3y = 2x + 1
y = 2/3x + 1/3
m = 2/3
maka :
y - 0 = 2/3(x - 0)
y = 2/3x - 0
y - 2/3x = 0
jadi persamaannya : y - 2/3x = 0
c.) 2x + 4y + 6 = 0
4y = -2x - 6
y = -2/4x - 6/4
m = -2/4
maka :
y - 0 = -2/4(x - 0)
y = -2/4x + 0
y + 2/4x = 0
jadi persamaannya : y + 2/4x = 0
Semoga membantu :)