Solve the system of equations by graphing.

y= -3x + 18
3x - 2y = 0

select the correct choice below and, if necessary, fill in the answer box to complete your choice.

a.
the solution set is { }.
(type an ordered pair.)

b.
there are infinitely many solutions. the solution set is {(x, y)|? }.
(type an equation.)

c.
there is no solution. the solution set is empty set.

graph the solution.