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3x + c =-y
diket titik (4,-1)
3(4) + c = 1
12 + c = 1
c = -11
jadi persamaannya 3x - 11 = -y / (-3x + 11 = y)
sry kalau salah
-1
y1 = -1
x1 = 4
y - y1 = m ( x -x1 )
y - (-1 ) = 3 (x - 4 )
y +1 = 3x -12
-3x + y + 1 + 12 = 0
-3x + y + 13 = 0
maaf kalo salah