persamaan garis yang melalui titik (5.2) dan (-7.8) adalah?

misal pake rumus paling dasar
(y - y1)/(y2 - y1) = (x - x1)/(x2 - x1)
(y - 2)/(8 - 2) = (x - 5)/(-7 - 5)
(y - 2)/6 = (x - 6)/-12
dikali 12
2(y - 2) = -(x - 6)
2y - 4 = -x + 6
2y + x - 10 = 0