Question

For the following system, if you isolated x in the second equation to use the Substitution Method, what expression would you substitute into the first equation? 3x + y = 8
-x - 2y = -10

Answer 1

-2y would replace y and -x would replace 8

Answer 2

x = 2y + 10 would be what you put into the first equation.
The first equation would then become  3(2y + 10) + y = 8