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How do I solve this? I was told that I needed to use a simultaneous equation somewhere, but I don't know how to. 
I have to find x and y in this equation, it's:

6980 = (x*69)+(y*71)

 

please help. 

 Sep 10, 2021
 #1
avatar+34376 
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You need another equation relating x and y to have a simultaneous equation set with a unique answer....otherwise the graph below shows all of the answer to this ONE equation relating x and y :

 

 

 

https://www.desmos.com/calculator/nfnpwdxblq

 Sep 10, 2021

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