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2y + 2 = (x - 7)
2y = + - 2
y = +
=
Syarat tegak lurus:
x = -1
x = -1
= -1 :
= -1 x
=
Maka, persamaan garis dengan gradien dan melalui titik (-2, -3) adalah:
y - = m(x - )
y - (-3) = (x - (-2))
7(y + 3) = 8(x + 2)
7y + 21 = 8x + 16
7y - 8x = 16 - 21
7y - 8x = -5