Line: 2y+8x-17=0
recall y = mx + c
2y = -8x + 17
y = -4x + 172\frac{17}{2}217
Slope m1_{1}1 = 4
parallel lines: m1_{1}1. m2_{2}2 = -4
where Slope ( -4) = y2−y1x2−x1\frac{y_2 - y_1}{x_2 - x_1}x2−x1y2−y1 at points (-1, -p) and (-2,2)
-4( x2−x1x_2 - x_1x2−x1 ) = y2−y1y_2 - y_1y2−y1
-4 ( -2 - -1) = 2 - -p
p = 4 - 2 = 2
