Question 183945
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Let {{{x}}}= one number
{{{y}}}= the other number
1st condition: {{{highlight(x)=3y}}}
2nd condition: {{{highlight(x)-y=13}}}
Substitute highlighted becomes:
{{{3y-y=13}}}
{{{2y=13}}}------->{{{cross(2)y/cross(2)=cross(13)6.5/cross(2)}}}
{{{highlight(y=6.5)}}}, the other number
{{{x=3*6.5=highlight(19.5)}}}, the number
Let's check via 2nd condition:
The difference is 13: 
{{{19.5-6.5=13}}}
{{{13=13}}}
Thank you,
Jojo</pre>