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Solve the system of equations x+y=4 and -9x+7y=-84 by combining the equations.

 Mar 5, 2021
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x+y= 4   * 7

 

-9x+7y = -84

-

7x+7y = 28

 

-16x=-56

x=3.5 y=0.5

 Mar 5, 2021

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