garis k melalui titik (-2,5) dan (2,4). Jika garis k tegak lurus garis l, tentukan gradien garis l! pake jalan fast yak

Bab Persamaan Garis
Matematika SMP Kelas VIII

garis k
m1 = (y2 - y1)/(x2 - x1)
m1 = (4 - 5) / (2 - (-2))
m1 = -1/(2 + 2)
m1 = -1/4

garis l
m1 x m2 = -1
(-1/4) x m2 = -1
m2 = -1 x (-4/1)
m2 = 4

gradien garis l = 4

y-y1 x-x1
-------= -------
y2-y1 x2-x1

y-5 x+2
------=--------
4-5 2+2

y-5 x+2
-----=--------
-1 4

4(y-5) = -1(x+2)
4y-20 = -x -2
4y=-x-2+20
4y=-x+18
y=-x/4 + 18/4

gradien= -1/4