Question

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)

Answer 1

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

3 x + 6 y = 12
-3 x + 2 y = -4
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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!