Question

Bantuin dong mtk soal no 18 jawaban dah ada cm caranya yg bingung

Answer 1

(3,-2) dan (4,1)

(y – y1) / (y2 – y1) = (x – x1) / (x2 – x1)

(y – (-2)) / (1 – (-2)) = (x – 3) / (4 – 3)

(y + 2) / 3 = (x – 3) / 1

y + 2 = 3(x –3)
y + 2 = 3x – 9
y = 3x – 9 – 2

y = 3x – 11 (A)

Answer 2

Titik (3,-2)dan titik (4,1)
Cari gradiennya dulu 
  m = y2 - y1 / x2 - x1
      = 1-(-2) / 4-3
      = 1+2/1
      = 3
Cari persamaannya dengan rumus m ( x - x1 ) = y - y1
   3 ( x -3) = y - (-2)
   3x -9 = y + 2
  3x - 11 = y ( jawaban : A )