persamaan garis L adalah... a. Y= -2× + 8 b. Y= 2× - 8 c. Y= - 1/2× + 2 d. Y= 1/2× - 2

Pers. garis G

y-y1/y2-y1 = x-x1/x2-x1
y-0/-2-0 = x-4/0-4
-4y = -2x+8
2x-4y = 8
x-2y = 4

Pers. garis L

Melalui titik (4,0) dan tegak lurus garis
G : x-2y = 4
Maka, pers. garis L :
bx-ay = bx1-ay1
-2x-y = -2(4)-1(0)
-2x-y = -8
2x+y = 8
......y = -2x+8

♠ A ♠