Math, help needed
posted by Mari .
Kate bought 3 CDs and 1 DVD at a store. Her friend Joel bought 2 CDs and 2 DVDs. If Kate spent $20 and Joel spent $22, determine the cost of a CD and DVD.
~Please provide an explanation as well.
Please and thanks!

3C + D = 20
D = 203C
2C + 2D = 22
Substitute 203C for D in second equation and solve for C. Insert that value into the first equation and solve for D. Check by inserting both values into the second equation.
Respond to this Question
Similar Questions

Algerbra 1
Shane and Kate are preparing to go on long car trips with their families. Shane bought 8 books and 2 CDs for $73.60. Kate bought 3 books and 4 CDs for $69.85. Both totals were withour tax. All of the books were the same price and all … 
math
Joel has twice as many CDs as Mariella has. Subtracting 7 from the number of CDs Joel has and dividing by 3 equals the number of CDs Blake has. If Blake has 25 CDs how many CDs does Mariella have? 
Math.
Kate bought 3 CDs and 1 DVD at a store. Her friend Joel bought 2 CDs and 2 DVDs. If Kate spent $20 and Joel spent $22, determine the cost of a CD and DVD. ~Please provide an explanation as well. Please and thanks! 
Algebra
Word Problems (Addition/Elimination Method). Check if my answers are correct. 1.A girl bought 2 CDs and 3 DVDs for $92. Each DVD costs $4 more than the CDs. What is the price of each CD and DVD? 
multi step equations
Joel has twice as many cds as Mary has. Subtracting 7 from the number of cds Joel has and dividing by 3 equals the number of cds Blake has. If Blake has 25 cds, how many cds does Mary have? 
math
Joel has twice as many cds as Mary has. Subtracting 7 from the number of cds Joel has and dividing by 3 equals the number of cds Blake has. If Blake has 25 cds, how many cds does Mary have? 
Math
Henry went to two different music stores to buy some new CDs. At Store A he bought 5 CDs for $70. At Store B he bought 6 CDs for $78. Which store had the best price for a CD and by how much? 
math
Austin spent an equal amount of money on 5 DVDs and 7 CDs. Each DVD cost 30 cents more than each CD. How much did Austin spend altogether? 
Algebra
Joel has twice as many CDs as Mariella has. subtracting seven from the number of CDs Joel has an dividing by three equals the number of CDs Blake has. If Blake has 25 CDs how many CDs does mariella have? 
Math
George bought some CDs at his local store. He paid $15.95 for each CD. Nora bout the same number of CDs from a store online. She paid $13.95 for each CD, but had to pay $8 for shipping. In the end, both George and Nora spent the exact …