Question

Tentukan subsitusi dari x+3y=6 dan 2x-5y= 20

Answer 1

X + 3y = 6
   x      = 6 - 3y

subtitusikan 
2x - 5y = 20
2(6 - 3y) - 5y = 20
12 - 6y - 5y = 20
    -11y        = 8
         y        = -8/11

maka nilai x = 6 - 3y
                    = 6 - 3(-8/11)
                    = 6 + 24/11
                x   = 90/11

Answer 2

X + 3y = 6 dan 2x - 5y = 20

x = 6 - 3y subsitusi ke persamaan 2x - 5y = 20
2x - 5y = 20
2(6 - 3y) - 5y = 20
12 - 6y - 5y = 20
12 - 11y = 20
-11y = 20 - 12
-11y = 8
y = 8/-11

y = 8/-11 substitusi ke persamaan x + 3y = 6
x + 3y = 6
x + 3(8/-11) = 6
x + 24/-11 = 6
x = 6 - 24/-11
x = (-66 - 24)/-11
x = -90/-11
x = 90/11

HP = {90/11 , 8/-11}