7x+ 1y=6

5x+3y=34.

The given system of equation can be solved be substitution method.  Using the first equation, y= 6-7x.  Substitute this in the other equation as follows:

 

5x + 3(6-7x)=34

5x + 18 -21x=34

 

-16x = 34 -18

16x =  -16

Which gives x= -1, and hence y=  6 –7(- 1)

                                                 Y= 13

 

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