document.write( "Question 821758: The sum of the ages of a father and son is 52. The difference their ages is 28, then the age of the father is....? \n" ); document.write( "

Algebra.Com's Answer #494395 by jhunjiro(67) $\"\"$ $\"About$

You can put this solution on YOUR website!
Let:
\n" ); document.write( "x - fathers age
\n" ); document.write( "y - sons age\r
\n" ); document.write( "\n" ); document.write( "Solution:
\n" ); document.write( " $\"x%2By=52+\"$ eq 1
\n" ); document.write( " $\"x-y=28+\"$ eq 2
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\n" ); document.write( " $\"+x=52-y+\"$ eq 3
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\n" ); document.write( "substitute to eq 2
\n" ); document.write( " $\"%2852-y%29-y=28\"$
\n" ); document.write( " $\"52-2y=28+\"$
\n" ); document.write( " $\"+-2y=-24\"$
\n" ); document.write( " $\"+highlight+%28y=12%29\"$ sons age
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\n" ); document.write( "substitute to eq 3
\n" ); document.write( " $\"+x=52-12\"$
\n" ); document.write( " $\"+highlight+%28x=40%29\"$ fathers age\r
\n" ); document.write( "\n" ); document.write( "other solution is elimination method:
\n" ); document.write( " add eq 1 and eq 2 to eliminate the y then solve for x. then substitute the value of x to eq 1 or eq 2 to get the value of y.
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