SOLUTION: the sum of two numbers is 15. Three times one of the numbers is 11 less then five times the other.Find the number.

Algebra ->  Customizable Word Problem Solvers  -> Evaluation -> SOLUTION: the sum of two numbers is 15. Three times one of the numbers is 11 less then five times the other.Find the number.      Log On

Ad: Over 600 Algebra Word Problems at edhelper.com


    

Question 417104: the sum of two numbers is 15. Three times one of the numbers is 11 less then five times the other.Find the number.
Answer by vanebutterfly01(1) About Me  (Show Source):
You can put this solution on YOUR website!
lets say X and Y are the "numbers" so it will be
X+Y=15
3x-5y=11
so we know that we can multiply so that you able to cancel out the 3x...so
we mulitply x+y=15 mulitply it by negative 3 so it can get canceled out.
so the new equation is -3x-3y=45
so now you can rewrite it as
-3x-3y=45
3x-5y=11
-8y=36
so then
-8y divided by -8 is just y so then 36/-8 is -4
so Y=-4