How do I solve surface area​

Aline has a slope of and a y-intercept of –2. what is the x-intercept of the line?

Set $r$ is a set of rectangles such that (1) only the grid points shown here are used as vertices, (2) all sides are vertical or horizontal and (3) no two rectangles in the set are congruent. if $r$ contains the maximum possible number of rectangles given these conditions, what fraction of the rectangles in set $r$ are squares? express your answer as a common fraction.

When a valve is open 281 gallons of water go through it in one hour the number of gallons that would go through in 94 hours is