Hi,

Solve the following system by the addition method

3x-7y= -12

3x+14y= -3 

Multiplying the first equation thru by 2 and adding the equations together

6x-14y= -24

3x+14y= -3 

9x = -27

x = -3

substituting x into 3x+14y= -3 

-9 + 14y = -3

14y = 6

y = 6/14 or 3/7

checking our answer with 3x-7y = -12

-9 - 3 = -12

  

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