Question 558750: Would this problem to substitution or elimination?
{2x-y=-3
{x+3y=10
Answer by rapaljer(4671)   (Show Source):
You can put this solution on YOUR website! I recommend the Elimination Method for this one. The substitution method works best when one of the equations is in the form of x=_____ or y=_____. If both equations are in standard form, as this one, multiply one or both of the equations by "appropriate" numbers so as to add the resulting equations together and eliminate one of the variables. In this case, if you want to eliminate the y variable, multiply both sides of the first equation by 3. If you want to eliminate the x variable, multiply both sides of the second equation by -2.
For additional examples and explanation like this, please see my website, and look for the page on Systems of Equations. To go to my website, use the easy-to-spell and easy-to-remember link www.mathinlivingcolor.com. At the very bottom of this page, there is a link that will take you to my Homepage.
Once you are on my Homepage, look for the link "Basic, Intermediate, and College Algebra: One Step at a Time." Choose "Basic Algebra", and look in "Chapter 4," then "Section 4.07 Systems of Equations" for a complete, non-traditional explanation that my own students, before I retired, found a lot easier to understand than the published textbooks of that day. You should really like my MATH IN LIVING COLOR pages, where the most difficult problems are solved IN COLOR.
Everything on the website is FREE. If you find something you really like, just print your own copy of it!!
If anyone needs to contact me, especially about the website, my Email address is rapaljer@seminolestate.edu. I'll be glad to help you find an explanation on my website to help you with your algebra topic!
Dr. Robert J. Rapalje, Retired
Seminole State College of Florida
Altamonte Springs Campus
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