You need to buy enough sand to fill a sandbox to the top. The sandbox is modeled by the right rectangular prism in the diagram. How much sand do you need to buy?

for every positive x value, the y value must be greater than 1.

for every negative x value, the y value must be less than 1.

in your options, you can check to see that one of these two criteria is met. if neither are met, then it is not on a slope with positive line.