X+4y=16

5x+4y=0

need to solve systems of equations by graphing

156:390 what is the ratio

The senior class has 350 students. How much is the total bill if the student government wants to buy each senior a T-shirt costing$7.20, and a yearbook costing$24.75?

Manny buys four boxes of straws for his restaurant. There are 500 straws in each box. How many straws does he buy?

Write an equation for the translation of y = |x|. 10.5 units left A. y = |x + 10.5| B. y = |x - 10.5| C. y = |x| - 10.5 D. y = |x| + 10.5

Tests show that the hydrogen ion concentration of a sample of apple juice is 0.0003 and that of ammonia is 3.1 x 10^-9. Find the pH of each liquid using the formula pH = - log |H3 0^+| where H3 0^ + is the hydronium ion concentration.

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.