Please help this test is timed

Solve the given system of equations. 2y= -x+9 , 3x-6= -15

Write an equation for the function that includes the points (2,100)and (3,100)

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).