Question 1169872
<pre>

{{{system(S = J - 5,S + J = 25)}}}

Solve that system by 

1. substituting (J-5) for S in the second equation,

2. Solve for J, which will by Joey' age.

3. Substitute the number you get for J in S = J - 5
and simplify.  That will be Suzy's age.


Edwin</pre>