What is the solution of the system of linear equations?
-3x + 4y = -18
2x - y = 77

What is an alternate exterior angle

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?

Last month, a 770 g box of cereal was sold at a grocery store for $3.10. however, this month, the cereal manufacturer launched the same cereal in a 640 g box, which is being sold at $2.50. what is the percent change in the unit price?