How do you substitute?

71/5-62/5 what is the answer

2. - 4x + 5y = 1 4x + 4y = 8

The Suez Canal links the Mediterranean and red seas. It is 103 miles long and was opened in 1869. For how many years has the Suez Canal been open

A new pair of tennis shoes at shoe show costs $80. They are on sale for 1/4 off. The sales tax is 5%. Find the total price.

There are 240 calories in 4 ounces of honey. How many calories are in 1 pound? (Note: 1 pound = 16 ounces)

A newspaper reporter wants to know how popular the hobby of bird watching is in the city. He asked people at the local bird refuge if they watched birds as a hobby. Which of the following best explains whether the reporters data is valid or not?

I am very confused on how to figure out if y = 3/4x is proportional?

Alison wants to buy a mountain bike for $339.12. If she saves $28.26 each month, in how many months will she be able to buy the bike?

At 12 o'clock the temperature was 7°C. The temperature decreased by - 20°C. What is the new temperature?

Ashleys rentals charges $27.50 per hour to rent a surfboard and a wetsuit. Darlas surf shop charges $23.25 per hour to rent a surfboard plus $17 extra for a wetsuit.