SPLDV 5x=2-y dan 15x+4y-11=0

Kelas 8 Matematika
Bab SPLDV

5x = 2 - y
y = 2 - 5x

15x + 4y - 11 = 0
15x + 4 (2 - 5x) - 11 = 0
15x + 8 - 20x - 11 = 0
-5x = 3
x = -3/5

y = 2 - 5x
y = 2 - 5 . (-3/5)
y = 2 + 3
y = 5

Maka, x = -3/5 dan y = 5

5x = 2 - y
y + 5x = 2
y = 2 - 5x

tentukan nilai x :

15x + 4y - 11 = 0
15x + 4( 2 - 5x ) - 11 = 0
15x + 8 - 20x - 11 = 0
-5x - 3 = 0
-5x = 3
[tex]x = - \frac{3}{5} [/tex]

tentukan nilai y :
y = 2 - 5x
y = 2 - 5(-3/5)
y = 2 + 3
y = 5

HP = { - 3/5 , 5 }