How can you represent a situation that has more than 1 solution?

Chose the graph below that represents the following system of inequality’s

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

The lines shown below are parallel. if the green line has a slope of -1, what is the slope of the red line?