A linear equation is graphed on the coordinate plane below.

The graph shows a coordinate grid with a straight line that passes through the points (negative 9, negative 5), (negative 6, negative 4) (negative 3, negative 3), (0, negative 2), (3, negative 1), (6, 0), and (9, 1).

When graphed on the same coordinate plane, which equation results in a system of equations with exactly one solution?

A. -2x+6y=-12

B. 3x-9y=9

C. x-3y=6

D. 9x-3y=6