Ican't remember how to solve a problem with two variables. how do i solve 4y=x+y+10?

He that is measured at 220° is a reflex angle. the opposite angle is obtuse. find the measure of obtuse .

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?

Point s lies between points r and t on . if rt is 10 centimeters long, what is st? 2 centimeters 4 centimeters 6 centimeters 8 centimeters