How do you solve the system of equations #7x + 2y = - 19# and #- x + 2y = 21#?
So, already we don’t have to change the equations in any way, seen as the
First, we’re going to eliminate the
We’re left with:
Divide everything by
Now simplify and find
If you want to check, then substitute
which is a correct statement.
Side note: I’ve used brackets instead of multiplication symbols as it makes it easier (at least for me) to see what’s been multiplied and what is