How do you use substitution to solve

y=12

2x-y=4

Raul took a test that had 40 questions. The ratio of his correct questions was 3:5. Find the number of questions he answered correctly.

Tell how you can use repeated reasoning to find multiplication facts.

What is the value of x in the proportion? 24/30 = 20/x

Write a function rule that produces an output of 7 for an input of 1.6

4m-4=4m solve this equation. prefer an explanation ...?

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.