Solve the system by substitution.
— бу = x
x + y = -30

How do i do this using elimination 2x+3y=12 x-y=6

Use complete sentences to differentiate between a regular tessellation, and a pure tessellation. be sure to include specific types of polygons in your explanation.

An elevator travels 310 feet in 10 seconds. at that speed, how far can't his elevator travel in 12 seconds?