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y - y1 / y2 - y1 = x - x1 / x2 - x1
y - 4 / 7-4 = x - 6 / 2-6
y - 4 / 3 = x -6 / -4
-4y + 16 = 3x - 18
3x +4y = 34
bagian b
y - y1 / y2 - y1 = x - x1 / x2 - x1
y - 8 / -8-8 = x + 9 / -5+9
y-8/-16 = x+9/4
4y-32= -16x-144
16x+4y = 112
bagian c
y - y1 / y2 - y1 = x - x1 / x2 - x1
y+6/8+6 = x-2/-3-2
y+6/14 = x-2/-5
-5y - 30 = 14x-28
14x + 5y = -58
maaf kalau salah