SOLUTION: solve the following system of equations for the unknown variables. a-6=2b a+b=15 answer has to show(#,#). i got a=12 b=3 but i know its wrong

Algebra ->  Systems-of-equations -> SOLUTION: solve the following system of equations for the unknown variables. a-6=2b a+b=15 answer has to show(#,#). i got a=12 b=3 but i know its wrong       Log On


   

Question 296883: solve the following system of equations for the unknown variables. a-6=2b a+b=15 answer has to show(#,#). i got a=12 b=3 but i know its wrong
Answer by JBarnum(2146) About Me  (Show Source):
You can put this solution on YOUR website!
this is substitution
a-6=2b
a%2Bb=15 or a=%2815-b%29
____________
a-6=2b
%2815-b%29-6=2b
15-b%2Bb-6=2b%2Bb
9=3b
highlight%283=b%29
___________
a=%2815-b%29
a=%2815-3%29
highlight%28a=12%29
YOU were right good job.