Which line has a constant of proportionality y and x of 1

Olivia uses the work below to determine 55% of 720 which explains the error in olivia’s solution

The spring the owner of a sporting good store decreases the price of winter gloves from $10 to $8 each increases the price of swimming goggles from $8 to $10 without doing the math you think the percent decrease in the price of the gloves the same as the percent increase of the goggles explain why or why not

Write and solve a real word problem that involves determining distance on a coordinate plane