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14e-7f=28

7e+f=50 what is e and what is x

 Jul 19, 2017
 #1
avatar+94619 
+1

14e - 7f  =  28

 7e +   f =   50 

 

Note that if we divide the top equation through by 7, we have

 

2e - f = 4      add this to the second equation  and we get

 

9e = 54        divide both sides by 9

 

e = 54/9  =  6

 

And using the second equation to find f, we have

 

7(6) + f  = 50

 

42 + f  =  50       subtract 42 from both sides

 

f  =  8

 

 

cool cool cool

 Jul 19, 2017

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