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(y - y1) / (y2 - y1) = (x - x1) / (x2 - x1)
(y-7) / (-3 -7) = (x - 2) / (-3 - 2)
(y - 7) / -10 = (x - 2) / -5
y - 7 = 2x - 4
y = 2x + 3
jika C (3 , a) adalah segaris maka nilai a adalah 9