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.