Asked by Anonymous

Solve using augmented matrices.
x + y = 1
3x – y = 7
Please help, I need a step-by-step explination. I dont understand it at all...
Answered by Anonymous
Please help, I really need help to even understand the subject. I am really lost...
Answered by oobleck
top: y = 1-x
so, use that in the bottom:
3x - (1-x) = 7
4x-1 = 7
x = 2
y = 1-x = -1
Answered by @oobleck
is that solving using augmented matrices?
Answered by oobleck
no, that is substitution.
Looks like you need to review elimination and augmented matrices.
Answered by @oobleck
I tried but I didn't understand it. I was saying that
Answered by @oobleck
Your answer didn't help at all. I already know how to solve using elimination and substitution. But thanks anyway...