document.write( "Question 64389This question is from textbook McDougal Littell
\n" ); document.write( ": Question #21 is Use the substitution method to solve the linear system. These are the equations:2x+3y=31, y=x+7 i tried to substituted it then it looked like this 2x+3(x+7)=31 then i combined like terms and it looked like this 5x+7=31 i took away the 7 to both sides and got 5x=24 i divided both sides by 5 to isolate the variable and got x=4.8 then i plugged that in for the next equation and i got 2(4.8)+3y=31 i solved the x so i got 9.6+3y=31 i subtacted the 9.6 and then it looked like this 3y=21.4 i dived it by three and i ended up with y=7.13 so the answer i got was (4.8,7.13) but the answer in the back of the book says it's (2,9) i don't know what i did wrong. please help me?
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Algebra.Com's Answer #45019 by stanbon(75887) $\"\"$ $\"About$

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Question #21 is Use the substitution method to solve the linear system. These are the equations:2x+3y=31, y=x+7 i tried to substituted it then it looked like this 2x+3(x+7)=31 then i combined like terms and it looked like this 5x+7=31
\n" ); document.write( "Whoops: Right here you should have 5x+21=31.
\n" ); document.write( "Then x=2
\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.\r
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