SOLUTION: Alyssa is buying miniature cars. She wants to buy 17 cars total for a big race she and her friends are having. Silver cars are $5 dollars each. Red cars are $7 dollars each. If she

Question 1070949: Alyssa is buying miniature cars. She wants to buy 17 cars total for a big race she and her friends are having. Silver cars are $5 dollars each. Red cars are $7 dollars each. If she spends $111, how many red cars did she buy. Question=Write 2 equations s=silver and r=red.
Is this an equation i could use as an answer? 111=xR+yS
Answer by KMST(5328) (Show Source): You can put this solution on YOUR website!
They mean for you to use and as your variables, like this:
= number of red cars bought
= number of silver cars bought.
The total number of cars bought is
and that is one of your equations.
The other one deals with the amount spent buying those cars.
The red cars costed $ .
The silver cars bought costed $ .
The amount Alyssa spent buying all those cars was $111, so
, and that is the other equation you need.
You need to solve the system of linear equations
<--->
but if you only need the value of ,
substituting for in
will give you an equation that you can solve for :

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