Question

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.
Solve for y in the second equation, and substitute x over 3 for y in the first equation.
GPT 3.5
The best way to start solving the given system using substitution is to solve for y in the second equation and substitute the solution for y in the first equation.

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