what would the equation be for example if you

Question

had dimes and quarters that equaled to $5.25 when you don't know how many coins you have--or must you have the amount of coin

 

 

 

i would like a step by step equation to figure this out because I don't know how to go about it.

thank you. 

Answer 1

you have q quarters and d dimes; you have 5.25 = 0.25q + 0.10d.

 

You have one equation and two unknowns. There could be several solutions. If you had one other valid fact, there would be one solution, exactly.