Question

3. Diketahui garis yang melalui titik (-3,7) dengan gradien m (-3/5) . Tentukan persamaan garis tersebut!
4. Garis s melalui titik B (-2,9) dan tegak lurus garis 3y-8x+24=0 . Tentukan persamaan garis s!

Answer 1

Persamaan garia melalui titil (-3,7) gradien : m : -3/5 :
y-y1 = m(x-x1)
y-7 = -3/5(x+3)
y-7 = -3/5x - 9/5
y = -3/5x - 9/5 + 7
y = -3/5x + 26/5
5y = -3x + 26
3x + 5y - 26 = 0

Answer 2

No 3
y-y1 = m(x-x1)
y-7 = -3/5 (x+3)
y-7 = -3/5 x -9/5
y = -3x/5 - 9/5 + 7
y = -3x/5 - 9/5 + 35/5
y = -3x/5 + 26/5
------------------------ x 5
5y = -3x + 26

no 4
3y-8x+24 = 0
a = -8
b = 3

m1 =

m1 =

m1 = 8/3

m2 =

m2 =

m2 = -3/8

y-y1 = m2(x-x1)
y-9 = -3/8(x+2)
y-9 = -3x/8 - 6/8
y = -3x/8 - 6/8 + 9
y = -3x/8 - 6/8 + 72/8
y = -3x/8 + 66/8
-------------------------- x 8
8y = -3x + 66