Question

Tolong dong caranya aja kenapa jawabannya bisa segitu

Answer 1

Verified answer

Mapel : Matematika

29] Persamaan Garis
2y - x + 3 = 0
m = -a/b
m = -(-1)/2
m = 1/2

Persamaan garis melalui titik (3, -4)

  y - y1 = m ( x - x1 )
y - (-4) = 1/2 ( x - 3 )
  y + 4  = 1/2x - 3/2
2y + 8  = x - 3
       2y = x - 3 - 8
       2y = x - 11
  x - 2y = 11
x - 2y + 11 = 0

30] Sistem Persamaan Linear Dua Variabel (SPLDV)
7x + 2y = 19   ⇒kali 3
4x - 3y  = 15   ⇒kali 2

21x + 6y = 57
  8x - 6y  = 30
------------------- +
        29x = 87
            x = 87/29
            x = 3

   7x + 2y = 19
7(3) + 2y = 19
  21 + 2y = 19
          2y = 19 - 21
          2y = -2
            y = -2/2
            y = -1

HP = { 3, -1 }