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.

Find the product. y^4 · y^6

Armando read 20 pages of his 200 page book in four hours. At this rate, how long will it take him to read the entire book?

If angle b = 60° and a = 10 meters, find b.

Which of the following are like terms? 12x A -8 3x2 15x -X x

A group of 20 students includes 5 students in sixth grade, 8 students in seventh grade, and 7 students in eighth grade. Each student's name and grade are written on an index card and placed in a bag. A card is randomly selected from the bag.

A pattern has 1,000 identical circles. If 665 of the circles are orange, what decimal represents the part of the pattern that is orange? Why? A. 665 B. 66.5 C. 6.65 D. 0.665

Perpendicular lines form angles

The cost of manufacturing A certain type of headphone varies inversely as the number of headphones increase. If 5000 headphones can be manufactured for $15.00 each find the cost to manufacture 7,500 headphones

Twice jacks age plus five is 21. Write and solve an equation. How old is jack

How can you make sure your solution is correct in a quadratic formula