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x+3y=32

y+4=x+8

 Sep 14, 2016
 #1
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X+3y=32

Y+4=x+8

 

Y=x+8-4

Y=x+4

 

X+3(x+4)=32

X+3x+12=32

4x=20

X=5

 

5+3y=32

3y=27

Y=9

 

5+3*9=32

5+27=32

32=32

 

9+4=5+8

13=13

 Sep 14, 2016
edited by Guest  Sep 14, 2016
edited by Guest  Sep 14, 2016
 #2
avatar+12288 
0

x+3y=32

y+4=x+8    |-4

    y=x+4

 

x+3(x+4)=32

x+3x+12=32     |-12

         4x=20     |:4

           x=5

 

5+3y=32   |-5

    3y=27   |:3

      y=9

 

laugh

 Sep 14, 2016

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