Question

x+y=7, 2x-4y= -16 solve graphically and by elimination method​

Answer 1

Answer:

x + y = 7

2x - 4y = -16

Therefore

Solve equation [1] for the variable  y 

 

[1] y = -x + 7

Plug this in for variable  y  in equation [2]

[2] 2x - 4•(-x +7) = -16   [2] 6x = 12

Solve equation [2] for the variable  x 

[2] 6x = 12    [2] x = 2 

By now we know this much :

  x = 2   y = -x+7

Solution :

 {x,y} = {2,5} 

Step-by-step explanation:

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