How do you solve the system #2x + y = 1# and #4x + 2y = −1# using substitution?
You can't since this system doesn't have a solution.
You can see this by trying subsitution.
First you seperate the
Then you plug this value in
2 equals -1??? That doesn't seem right. Since all our previous steps are correct, we can conclude that this system doesn't have a solution.
You could have also seen this quicker, by multiplying the first equation by two (which is allowed).
But the second equation says that