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(y-7)(-3-2) = (x-2)(-3-7)
-5y + 35 = -10x +20
10x - 5y + 15 = 0
(3,a)
10(3) - 5(a) + 15 = 0
45 = 5a
a = 9
-3 -3
5y = 10x + (2.-3 - 7.-3)
5y = 10x + (-6 - (-21)
5y = 10x + 15 di bagi 5
y = 2x + 3
a = 2.3 + 3
a = 9
(3,a)
x , y