You are given the system below to solve using the substitution method.
{ 5x + 6y = 17
x + 2y = 8
You decide to rearrange the second equation for x, since it has a coefficient of 1. This gives you x = 8 - 2y.
Which of the following is the proper way to use this new equation?
Plug it into the second equation to get (8 - 2y) + 2y = 8
Plug it into the first equation to get (8 - 2y) + 6y = 17
Plug it into the second equation to get x(8 - 2y) + 2y = 8
Plug it into the first equation to get 5(8 - 2y) + 6y = 17