Pls help I need a good grade on this

Solve the system of equations y= 3/2 - 1, -x+ y =-3

If the ratio of sum of the first m and n terms of an ap is m2 : n2 , show that the ratio of its mth and nth terms is (2m − 1) : (2n − 1).

#7. m is the midpoint of pq, the diameter of the circle o is 13in. and rm = 4in. find pm find pq