Y=2x-3 and y=-3x+7 using substitution

How do I I solve this equation? -18 = x/3 + 3

In 2005 a house was purchased for $280,000 and in 2013 it was sold at $334,000. Assuming that the value of the house increased at a constant annual rate what will be the price of the house in the year 2018?

What's the sum of - 62 and its opposite?

An art teacher had 2/3 gallon of paint to pour into containers if he poured 1/8 gallon of paint into each container until he ran out of paint how many containers had painting them including the one that was partially filled?

36x-8y^2 when x=-3 and y=-6

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.