garis p (-2,4) dan (-4,1) dan garis q (3,a)dan (5,-1) tentukan nilai a agar garis q sejajar dengan garis p !

garis P (-2, 4) dan (-4, 1)
x1 = -2
y1 = 4
x2 = -4
y2 = 1

m = (y2 - y1) / (x2 - x1)
m = (1 - 4) / (-4 - (-2))
m = -3 / -2
m = 3/2


Garis q (3, a) dan (5 , -1)
x1 = 3
y1 = a
x2 = 5
y2 = -1

m = (y2 - y1) / (x2 - x1)
m = (-1 - a) / (5 - 3)
m = (-1 - a) / 2

Syarat sejajar m1 = m2

(-1 - a) / 2 = 3/2
-1 - a = 3
-a = 3 + 1
-a = 4
a = -4