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Gradien (m) = -a/b = -2/7
Kalau sejajar artinya gradien sama.
y-y1= m (x-x1)
y-1 = -2/7 (x-(-5)
y-1 = -2/7 (x+5)
y-1 = -2/7x + -10/7
(Dikalikan 7 semua agar bentuk pecahan hilang)
7y-7 = -2x - 10
2x + 7y = -10 + 7
2x + 7y = -3