Lucy has 34 coins consisting of nickels and quarters amounting to $2.90. How many coins of each kind does she have?
I am going to give nickels and quarters their own variable. Nickels will be
The second part is about the value of the coins. Since nickels are worth 5 cents (or
I'm actually going to multiply this whole equation by
Now we will rearrange the first equation to solve for one variable:
Substitute that into the second equation and solve for