let C be the price of the cd player in dollars and R the price of a radio in

dollars. You are told that:

C=2R+10,

and that R=25,

so:

C=60

so the cd player costs $60.

2. If a radio $31, what is the cost of a CDplayer?

3. Write an equation using the prices of the cd player and radio.Use c for the price of the cd player. Use r for the price of the radio.

These should be obvious now.

RonL