Question 1125412
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The sum of two numbers is 36. The first number is 
1/5 of the second number. 
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first number, x
second number, y

{{{system(x+y=36,x=5y)}}}


This can also be stated in  {{{system(x+y=36,5x=y)}}} and substitution is obvious and easy to do.


{{{x+5x=36}}}
{{{6x=36}}}
{{{x=6}}}---------------{{{y=30}}}