document.write( "Question 1133879: I am 20 years older than twice my daughter's age. How old is my daughter? \n" ); document.write( "

Algebra.Com's Answer #751128 by josmiceli(19441) $\"\"$ $\"About$

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Let $\"+x+\"$ = my age
\n" ); document.write( "Let $\"+y+\"$ = my daughter's age
\n" ); document.write( " $\"+x+=+2y+%2B+20+\"$
\n" ); document.write( "subtract $\"+20+\"$ from both sides
\n" ); document.write( " $\"+x+-+20+=+2y+\"$
\n" ); document.write( "Divide both sides by $\"+2+\"$
\n" ); document.write( " $\"+y+=+%281%2F2%29%2Ax+-+10+\"$
\n" ); document.write( "In words, this is saying that my daughter's age
\n" ); document.write( "is ten years less than half my age
\n" ); document.write( "--------------------------------------------------
\n" ); document.write( "check:
\n" ); document.write( "Suppose I am 40, or $\"+x+=+40+\"$ , then
\n" ); document.write( " $\"+40+=+2y+%2B+20+\"$
\n" ); document.write( " $\"+20+=+2y+\"$
\n" ); document.write( " $\"+y+=+10+\"$
\n" ); document.write( "and
\n" ); document.write( " $\"+y+=+%281%2F2%29%2Ax+-+10+\"$
\n" ); document.write( " $\"+y+=+%281%2F2%29%2A40+-+10+\"$
\n" ); document.write( " $\"+y+=+20+-+10+\"$
\n" ); document.write( " $\"+y+=+10+\"$
\n" ); document.write( "OK \n" ); document.write( "

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