Simply each expression by combining like terms 3a + 5 + ×+7×-a

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.

How many solutions does the nonlinear system of equations graphed below have?

If y varies directly as x2 and y=6 when x=6, find the constant of variation.