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y - y1 / y2 - y1 = x - x1 / x2 - x1
y - 3 / 8 - 3 = x - 2 / 6 - 2
y - 3 / 5 = x - 2 / 4
4 (y - 3) = 5 (x - 2)
4y - 12 = 5x - 10
4y = 5x +12 - 10
4y = 5x + 2
b. (-4.5) dan (-4,3)
y - y1 / y2 - y1 = x - x1 / x2 - x1
y - 5 / 3 - 5 = x - (-4) / -4 - (-4)
y - 5 / -2 = x + 4 / 0
0 (y - 5) = -2 (x + 4)
0 = -2x - 8
a.
b.
(tak terdefenisi) berarti tdk memiliki kemiringan, garisnya vertikal sejajar sumbu y