Question

Tolong gunakan metode subtitusi 4x+y=-6 dan -2x-y=4 tolong :).

Answer 1

4x + y = - 6
       y = -6 - 4x

-2x - y = 4
-2x - ( -6 - 4x) = 4
-2x + 6 + 4x = 4
2x = 4 - 6
2x = -2
 x = -1

y = -6 - 4x
  = -6 - 4(-1)
  = -6 + 4
  = --2

Answer 2

Metode subtitusi
y = -4x - 6
maka subtitusikan
-2x - (-4x - 6 )= 4
-2x + 4x + 6 = 4
     2x  = 4 -6
     2x  = -2
       x  = -2/2
       x  = -1
subtitusikan lagi
4x + y = -6
y = -6 -4x
y = -6 -4(-1)
y = -6 + 4
y = -2