Given the following system, what would be the best way to start solving this using substitution? x+y=20 x=3y (1 point) Responses Solve for y in the first equation, and substitute the solution for y in the second equation. Solve for y in the first equation, and substitute the solution for y in the second equation. Substitute 3y from the second equation for x in the first equation. Substitute 3y from the second equation for x in the first equation. Solve for x in the first equation, and substitute the solution for x in the second equation. Solve for x in the first equation, and substitute the solution for x in the second equation. Solve for y in the second equation, and substitute x3 for y in the first equation.
The best way to start solving this system using substitution would be to solve for y in the first equation and substitute the solution for y in the second equation.
