Please help answer the math question below

How can you decide witch operations to use to slice a two step equation

The point of intersection of the diagonals of a rectangle is 4 cm further away from the smaller side then from the larger side of the rectangle. the perimeter of the rectangle is equal to 56 cm. find the lengths of the sides of the rectangle. 16 points answer quick

Which point-slope form equation represents a line that passes through (3,-2) with a slope of -4/5