Is this relation a function{(1,2),(3,5),(6,7),(8,2)}?

What is the perimeter of a rectangular building that is 80 feet wide and 140 feet deep?

Billy plotted −3 4 and −1 4 on a number line to determine that −3 4 is smaller than −1 4 is he correct? explain why or why not?

Solve the following simultaneous equation by using an algebraic method (either substitution or elimination) 2x + 3y=-4 4x-y=11