m= ax + c
y = 2x - 9
m = 2
karena tegal lurus m = -1/2
(3,2)
y - y1 = m (x - x1)
y - 2 = -1/2 (x - 3)
y - 2 = -1/2x + 3/2
dikali dengan 2
2y - 4 = -x + 3
2y + x - 4 - 3 = 0
2y + x - 7 = 0
dikali dengan -1
-2y - x + 7 = 0
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m= ax + c
y = 2x - 9
m = 2
karena tegal lurus m = -1/2
(3,2)
y - y1 = m (x - x1)
y - 2 = -1/2 (x - 3)
y - 2 = -1/2x + 3/2
dikali dengan 2
2y - 4 = -x + 3
2y + x - 4 - 3 = 0
2y + x - 7 = 0
dikali dengan -1
-2y - x + 7 = 0