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Help me

Solve by addition or subtraction

3x-5y=-5

+ 2x+3y=22

ManuelBautista2019  Sep 24, 2017
edited by ManuelBautista2019  Sep 24, 2017
 #1
avatar+91153 
+1

3x - 5y = -5

2x + 3y = 22

 

 

Multiply the frist equation through by 3   and the second through by 5  ..... and we have that

 

9x   -  15y  =  - 15

10x + 15y =    110      add these

 

19x  = 95      divide both sides by 19

 

x  =  5

 

And using 2x + 3y = 22 to find y, we have

 

2(5) + 3y  = 22

10 + 3y  = 22      subtract 10 from both sides

3y  = 12              divide both sides by 3

y  = 4

 

 

 

cool cool cool

CPhill  Sep 24, 2017

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