posted by Jack on .
It does, thanks.
I'm currently working on solving algebraic equations with two variables (Example: 3x+4y=9). The computer lesson has taught me nothing but to solve the equation by trial and error -- selecting the proper ordered pair from a multiple choice list after plugging it in to see if it's correct. So, what happens when I don't have a convenient little list of ordered pairs to plug in? Is there a way to solve it from scratch like a one-variable equation?
There is a way to solve this problem from scratch.
You first find a value for either X or Y and then plug that instead of X or Y and solve for the other one.
3X + 4Y = 9
3X = 9 - 4Y
X = (9-4Y)/3
Now plug that instead of X to make it a one variable equation.
3[(9-4Y)/3) + 4Y = 9
That should result as Y=1
Than, plug 1 instead of Y to get X.
3X + 4(1)=9
that should result as X = 5/3
Than, plug the number for both X and Y.
3(5/3) + 4(1)=9
Hope it helps.