How do you find cot, sec, and csc ​

(98 points) i need with 5 questions. answer definitions are welcomed, but not necessary.

Use the elimination method to find the solution to the system of equations. 2x - 3y = -9 -x + 3y = 6

Aplane intersects a pris paralel to the base of the prism. the cross section is a polygon wth eight sides. how many sides does the base of the prism have? a. 10 b. 8 c. 7 d. 9