Question

Persamaan garis yg melalui titik (1,-3) dan sejajar dengan garis 2x-y+4=0 adalah....
A. y=1/2x + 1
B. y=1/2x - 3
C. y=2x + 4
D. y=2x + 5

Answer 1

Cari gradien:
2x-y+4 = 0
  2 dx = 1 dy
dy/dx = 2/1
dy/dx = 2
      m = 2

persamaan garis yg melalui (1,-3):
y-y1 = m(x-x1)
y+3 = 2(x-1)
    y = 2x-2-3
    y = 2x-5................ga ada di pilihan jawaban

Answer 2

Garis 1 : 2x-y+4=0, m1= -2/-1 =2
garis 2 : (1,-3) ,m2...?

jawab:
rumus=
y-y1= m (x-x1)
y-(-3)= 2(x-1)
y+3 = 2x-2
y = 2x-2-3
y = 2x-5
gak ada pilihan