Are you familiar with substitution? In the second equation, can you solve for one variable to plug into the first equation?Originally Posted by gilmoujr
I have two equations:
18x + 3y = 120
x + y = 15
I know that the answers are:
x = 5
y = 10
I could only solve it by punching in numbers and seeing if the problem was solved. I would like to know HOW to come about with the answer using Algebra.
My humblest apologies. I actually remembered how to do it shortly after posting the question. When I came back (after explaining to my daughter how to do it), you had already responded. I appreciate the assistance that you provide (and this forum). I am going to bookmark it for my daughter's (and mine for that matter) reference. I searched the internet for over an hour before getting a hit to your site.
Again, thank you very much for the excellent forum.