Solve by substitution

9x-5y=-30

x+3y=18

What number, when subtracted by 15, equals 18?

Write an equation of the line with the given slope and y-ntercept - 5, b-4

A falling object accerlates from - 10.0m/s to - 30.0m/s how much time does that take

A concert promoter charges $65 per ticket for a concert. The promoters cost will be $5500 plus $4 per ticket.

10.3 divided by 1.4 = what

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.