How can I solve the following system of equations: - 4x + y = 6, - 5x - y = 21. I know I can cancel out but I don't know where or where to go from there.

If (-2, y) lies on the graph of y = 3x, then y = ?

There are 150 adults and 225 children at a zoo. If hte zoo makes a total of 5100 from the entrance fees, and the cost of an adult and a child is 31 how much does it cost each parent for a parent and a child

A small company's net income for the first six month of the year was 76,500 and for the last six months it was 100,000 what is the ratio of the first six months of the year to the last six month

Marlon took a total of 12 pages of notes during 3 hours of class. After attending 4 hours of class, how many total pages of notes will Marlon have in his notebook? Assume the relationship is directly proportional.

In a 30 60 90 triangle if the long leg is 12 what is the short leg

Which expression is equivalent to 28 (15+9) ? 28 + 15 x 28 + 9 28 x 15 + 9 28 + 15 + 28 + 9 28 x 15+28 x 9

9. 1/2 (16 + 4 + 4) + (6 X 4 = 8) I do not no how to do this

What is the minimum value of the function y=x^2+3x-4?

What time is 46 minutes before 2:10 pm

James recently installed a new pool in his backyard the pool is 20 ft long 15 feet wide and 5 ft deep, what is the volume