Find the least common multiple of the monomials

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The diagonals of a quadrilaretral intersect at (-1,4). one of the sides of the quadrilateral is bounded by (2,7) and (-3,5) determine the coordinates of the other side in order for the quadrilaretral to be a square.

The length of a rectangle plus its width is 24 cm. the area is 143 square cm. what are the length and width of the rectangle?