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Which system of equations is equivalent to the system of equations shown?

x - 2y = 4
3x + y = 9




A) 4x + y = 13 and 2x + 4y = -8
B) 4x - y = 13 and 2x + 4y = 8
C) 4x + y = 13 and 2x - 4y = -8
D) 4x - y = 13 and 2x - 4y = 8

Respuesta :


     x+y= 4  (-2)
3x+2y = 9

-2x -2y = -8
 3x +2y = 9  
x           = 1

1+y =9
y = 9-1 
y =8
texaschic101
x - 2y = 4
3x + y = 9

is equivalent to :
4x - y = 13
2x - 4y = 8

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