document.write( "Question 121692This question is from textbook
\n" ); document.write( ": Substitition-\r
\n" ); document.write( "\n" ); document.write( "x + y = 13
\n" ); document.write( "y - x = -7 \n" ); document.write( "

Algebra.Com's Answer #89364 by Fombitz(32388) $\"\"$ $\"About$

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1. $\"x+%2B+y+=+13\"$
\n" ); document.write( "2. $\"y+-+x+=+-7\"$
\n" ); document.write( "Use equation 2 to get an expression for y in terms of x.
\n" ); document.write( "2. $\"y+-+x+=+-7\"$
\n" ); document.write( " $\"y+=+-7+%2B+x\"$
\n" ); document.write( "Now substitute that expression into equation 1 and solve for x.
\n" ); document.write( "1. $\"x+%2B+y+=+13\"$
\n" ); document.write( " $\"x+%2B+%28-7%2Bx%29+=+13\"$
\n" ); document.write( " $\"2x-7=13\"$
\n" ); document.write( " $\"2x=20\"$
\n" ); document.write( " $\"highlight%28x=10%29\"$
\n" ); document.write( "From equation 2,
\n" ); document.write( " $\"y+=+-7+%2B+x\"$
\n" ); document.write( " $\"y+=+-7+%2B+10\"$
\n" ); document.write( " $\"highlight%28y+=+3%29\"$
\n" ); document.write( "Check your answers.
\n" ); document.write( "1. $\"x+%2B+y+=+13\"$
\n" ); document.write( " $\"10%2B3=13\"$
\n" ); document.write( " $\"13=13\"$
\n" ); document.write( "True statement
\n" ); document.write( "2. $\"y+-+x+=+-7\"$
\n" ); document.write( " $\"3-10=-7\"$
\n" ); document.write( " $\"-7=-7\"$
\n" ); document.write( "Ture statement.
\n" ); document.write( "Your answers led to true statements.
\n" ); document.write( "They are good answers. \n" ); document.write( "

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