which ordered pair is a solution of the system of equations

y=-3/5x

x-3y=-42

A. (70,-42)

B. (-21,63/50)

C. (5,3)

D. (-15,9)

y=-3/5x

x-3y=-42

Plug the first one into the second one, for 'y':

x - 3 (-0.6x) = - 42

x + 1.8x = - 42

2.8x = - 42

x = - 42/2.8 = - 15

Plug this back into the first equation above:

y = - 0.6 (15) = 9

The 'ordered pair' is (-15, 9). That's choice (D.).