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solve the system of equations:

500x=25-y

200x=16-y

Pizzaza6912  Mar 23, 2017
edited by Pizzaza6912  Mar 23, 2017
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2+0 Answers

 #1
avatar+9 
+1

Please answer

Pizzaza6912  Mar 23, 2017
edited by Pizzaza6912  Mar 23, 2017
 #2
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500x=25-y     (1)

200x=16-y     multiply through by  -1   =  -200x = -16 + y    (2)

 

Add (1)  to (2)   and we get

 

300x  = 9         divide both sides by 300

 

x  = 9 / 300  =  3 / 100

 

And using (1)  to find y, we have

 

500 (3 / 100)  = 25 - y

 

15  = 25  - y        add y to both sides ,  subtract  15 from both sides

 

y  = 25  - 15   = 10

 

 

cool cool cool

CPhill  Mar 23, 2017

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