persamaan garis melalui titik p ( -2,7) & Q ( 6,9) adalah

P = (-2, 7) maka x1 = -2 dan y1 = 7
Q = (6, 9) maka x2 = 6 dan y2 = 9

Rumus
y - y1/y2-y1 = x - x1/x2 - x1
= y - (7)/9 - (7) = x - (-2)/6 - (-2)
= y - 7/2 = x + 2/8
= 8(y - 7) = 2(x + 2)
= 8y - 56 = 2x + 4
= 8y = 2x + 60 (Dibagi 2)
= 4y - x + 30 = 0

Semoga membantu!!!