Which of the systems of equations is best set up for solving using elimination?

A. y = 4x - 3
2x + y = 9

B. x + y = 18
2x + 5y = -3.

c. 3x - 4y = 5
2x + 4y = -3

D
x = 2y
3x - 2y = 7

Alex drew a circle with right triangle prq inscribed in it, as shown below: the figure shows a circle with points p, q, and r on it forming an inscribed triangle. side pq is a chord through the center and angle r is a right angle. arc qr measures 80 degrees.

Which one is the correct answer, and why?

Erik buys 2.5 pounds of cashews. if each pound of cashews costs $7.70, how much will he pay for the cashews?