Which expression is equivalent to 30°?

Which equation results from adding the equations in this system? x+6y=9 and -x+2y=-15

Adecorative window is made up of a rectangle with semicircles at either end. the ratio of ad to ab is 3: 2 and ab is 30 inches. what is the ratio of the area of the rectangle to the combined area of the semicircles? possible answers: a. 2: 3 b. 3: 2 c. 6: π d. 9: π e. 30: π

3x + 4y = 5 x- 3y = -7 solve by substitution