Solve the system using the substitution or elimination method {2x−6y=8,−3x+9y=−12. how many solutions are there to this system? a. none b. exactly 1 c. exactly 2 d. exactly 3 e. infinitely many f. none of the above if there is one solution, give its coordinates in the answer spaces below. if there are infinitely many solutions, enter x in the answer blank for x and enter a formula for y in terms of x in the answer blank for y. if there are no solutions, leave the answer blanks for x and y empty.