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Help me please

Solve for x and Y

any fractions answer Round it off to the nearest tenth

 

{3x+2y=5

{5x+3y=7

ManuelBautista2019  Dec 5, 2017
 #1
avatar+87635 
+2

3x + 2y = 5

5x + 3y = 7

 

We can choose to eliminate y thusly  :

 

Multiply the first equation  by  3   and the second by -2

 

9x     +   6y   =   15

-10x  -   6y    =  -14      add these

 

-1x   =  1       divide both sides by -1

 

x  =  -1

 

And using   3x +  2y  =  5   to find y  we have

 

3(-1)  + 2y   = 5

-3 + 2y   =  5       add 3 to both sides

2y  =  8     divide both sides by 2

y  =  4

 

 

So  {x, y}   =  {-1, 4 }

 

 

 

cool cool cool

CPhill  Dec 5, 2017

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