document.write( "Question 943759: Help me answer this?
\n" ); document.write( "Jack is twice as old as Jill. Into years Jack will be four times as old as Joel was nine years ago. How old are they now? \n" ); document.write( "

Algebra.Com's Answer #575412 by josmiceli(19441) $\"\"$ $\"About$

You can put this solution on YOUR website!
Let $\"+a+\"$ = Jack's age now
\n" ); document.write( "Let $\"+b+\"$ = Jill's age now
\n" ); document.write( "-------------------------
\n" ); document.write( "(1) $\"+a+=+2b+\"$
\n" ); document.write( "(2) $\"+a+%2B+2+=+4%2A%28+b+-+9+%29+\"$
\n" ); document.write( "-------------------------
\n" ); document.write( "(2) $\"+a+%2B+2+=+4b+-+36+\"$
\n" ); document.write( "By substitution:
\n" ); document.write( "(2) $\"+2b+%2B+2+=+4b+-++36+\"$
\n" ); document.write( "(2) $\"+2b+=+38+\"$
\n" ); document.write( "(2) $\"+b+=+19+\"$
\n" ); document.write( "and
\n" ); document.write( "(1) $\"+a+=+2b+\"$
\n" ); document.write( "(1) $\"+a+=+2%2A19+\"$
\n" ); document.write( "(1) $\"+a+=+38+\"$
\n" ); document.write( "Jack is 38
\n" ); document.write( "Jill is 19
\n" ); document.write( "------------
\n" ); document.write( "check:
\n" ); document.write( "(2) $\"+a+%2B+2+=+4%2A%28+b+-+9+%29+\"$
\n" ); document.write( "(2) $\"+38+%2B+2+=+4%2A%28+19+-+9+%29+\"$
\n" ); document.write( "(2) $\"+40+=+4%2A10+\"$
\n" ); document.write( "(2) $\"+40+=+40+\"$
\n" ); document.write( "-----------------
\n" ); document.write( "I think this is it. Work on your typing
\n" ); document.write( "It was terrible
\n" ); document.write( " \n" ); document.write( "

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