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## Sagot :

Okay well first off you want to get x alone on one side of the equals sign.

x - 7 = -4y

+ 7 + 7

---------------

x = -4y + 7

Then you plugin -4y + 7 for x in the other equation.

2(-4y + 7) + 4y = 16

Then distribute.

-8y + 14 + 4y = 16

Combine like terms.

-4y + 14 = 16

-14 -14

-----------------------

-4y = 2

---- ------

-4 -4

y = -0.5

x - 7 = -4(-0.5)

-----------------------

x - 7 = 2

+ 7 +7

----------------

x = 9

Then you plugin the answers for each variable to check, but I will let you do that.