Question

Tentukan penyelesaian sistem persamaannya!

tolong dibantu !

Answer 1

Verified answer

Chapter System of Linear Equations
Class 8 SMP
Mathematics

"Two Variable Linear Equation Systems"
Mixed Methods (Substitution - Elimination)


Settlement


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

        y = 2x² + 3x - 2


           2x² + 3x - 2 = 1 + 2x
2x² + 3x - 2x -2 - 1 = 0
             2x² + x - 3 = 0
      (2x + 3) (x - 1) = 0

        2x = -3              x - 1 = 0
          x = -3/2                x = 1


If x = -3/2                     if x = 1

   y = 1 + 2x                    y = 1 + 2x
      = 1 + 2 (-3/2)               = 1 + 2 (1)
      = 1 + -3                       = 1 + 2
   y = -2                          y = 3


 Settlement set = {-3/2 , -2 atau 1, 3}


I Hope This Helps!!!