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4x+2y=14

Guest Nov 30, 2017
 #1
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PLEASE HELP ME

Guest Nov 30, 2017
 #3
avatar+90978 
+1

We need two equations in order to use elimination....

 

 

cool cool cool

CPhill  Nov 30, 2017
 #4
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2x+4y=22

2x-2y=14

Guest Nov 30, 2017
 #5
avatar+7331 
+3

2x + 4y  =  22

2x - 2y  =  14

 

Multiply the second equation through by  2 . So the two equations become:

 

2x + 4y  =  22

4x - 4y  =  28

 

Now add the two equations together to get...

 

6x + 0  =  50

 

6x  =  50          Divide both sides of this equation by  6 .

x  =  25/3

 

Now lets plug this value for  x  back into one of the equations to find  y .

 

2(25/3) + 4y  =  22         Multiply  2(25/3)  to get  50/3 .

 

50/3 + 4y  =  22              Subtract  50/3  from both sides of this equation.

4y  =  22 - 50/3

4y  =  16/3                      Divide both sides by  4 .

y  =  4/3

hectictar  Nov 30, 2017

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