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y - y1 = m(x - x1)
y - 4 = - 1/3 (x - 0)
y - 4 = - 1/3x + 0
y - 4 = - 1/3x
y = - 1/3x + 4
b) dik : m = -4 melalui titik (1,-2)
y - y1 = m(x - x1)
y - (-2) = -4 (x - 1)
y + 2 = -4x + 4 - 2
y = -4x + 2
c) dik : titik (1,6) & (7,4)
y - y1 = x - x1
y2 - y1 x2 - x1
y - 6 = x - 1
4 - 6 = 7 - 1
y - 6 = x - 1 (dikali silangkan)
-2 = 6
6(y - 6) = -2 (x - 1)
6y - 36 = -2x + 2
6y = -2x + 2 + 36
6y = -2x + 38
2x + 6y - 38 = 0
itu jawabannya:) maaf kalo salah;D