For what value of a do the lines 5x–2y=3 and x+y=a intersect at a point on the y-axis?

This race was first held in 1953 on august 16th. every decade the race finishes with a festival. how many years is this?

Which statements regarding efg are true? check all that apply.

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.