Cross multiplication method, find the value z and y for 3x + 5y = 70 and 7x-3y =60

In the diagram, the measure of angle 9 is 85° which angle must also measure 85°?

Find the area of the regular hexagon if a side is 20 cm.

The cross-sectional areas of a right triangular prism and a right cylinder are congruent. the right triangular prism has a height of 6 units, and the right cylinder has a height of 6 units. which conclusion can be made from the given information? the volume of the triangular prism is half the volume of the cylinder. the volume of the triangular prism is twice the volume of the cylinder. the volume of the triangular prism is equal to the volume of the cylinder. the volume of the triangular prism is not equal to the volume of the cylinder.