Question 1136498
<pre>
You copied something wrong.  As it is, it comes out that the older brother is
 
7.8654599313 and the younger brother is 3.432729966.

I think 27 should be 21.

</pre>
the product of two brothers' ages is 21.
{{{matrix(1,7,

(matrix(3,1,OLDER,"BROTHER'S",AGE)),
""*"",
(matrix(3,1,YOUNGER,"BROTHER'S",AGE)),
"",
""="",
"",
21)}}}

 the older brother is twice and one more than the younger

{{{matrix(1,7,

(matrix(3,1,OLDER,"BROTHER'S",AGE)),
"",
""="",
"",
2*(matrix(3,1,YOUNGER,"BROTHER'S",AGE)),
""+"",
1)}}}
<pre>
So

{{{system(x*y=21,x=2y+1)}}}

You solve by substituting 2y+1 for x in the first equation,
then solving for y, then substituting what you get for y in
x=2y+1 to find x.

Edwin</pre>