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y1 = 40
x1 = 3
y - y1 = m ( x - x1)
y - 40 = 3 (x - 3 )
y - 40 = 3x - 9
-3x + y - 40 + 9 = 0
-3x + y -31 = 0
y -4 = 3(x -3)
y -4 = 3x -9
y = 3x -9 +4
y = 3x -5
Itu jawabannya.