Does the equation y=2x+5 represent a linear equation

At the electronics store you have a coupon for 20% off up to 2 cds you buy for cds with the original cost of $10.99 each the sales tax is 5% what is the total cost of your purchase

Ana drinks chocolate milk out of glasses that each holdof a liter. she has of a liter of chocolate milk in her refrigerator. 10 how many glasses of chocolate milk can she pour?

A. what does the point (4, 122) represent? b. what is the unit rate? c. what is the cost of buying 10 tickets?