Please answer this properly​

Find the y-intercept and x-intercept for the equation 5x-3y=60 what is the y-intercept

Calculate the missing value. round the answer to on decimal place. start with 70, increase it by 21%, and end up with

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.