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Which ordered pair is a solution to the system of equations? Use the graph.

x+2y=4 (line a)
-3x+2y=-4 (line b)

A. (2,-1)
B. (-2,1)
C. (2,1)
D. (-2, -1)

Respuesta :

Willchemistry
 { x + 2y = 4    * ( 3 )
  -3 x + 2y = -4 

 3 x + 6 y = 12
-3 x + 2 y = -4
---------------------
          8 y = 8
      
             y = 8 / 8
           
             y = 1

For x :

x + 2 y = 4

x + 2*(1 ) = 4
 
x + 2 = 4

x = 4 - 2

x = 2

Answer C   ( 2 , 1 )

hope this helps!