7 is subtracted from 7 times a number

Prove that quadrilateral is a rhombus.

What are the solutions of the system? y = x^2 + 2x +3y = 4x - 2a. (-1, -6) and (-3, -14)b. (-1, 10) and (3, -6)c. no solutiond. (-1, -6) and (3, 10)

The midpoints of the sides of the large square are joined to form a smaller square. what is the area of the smaller square