document.write( "Question 987137: y=x^2−10
\n" ); document.write( "9x^2−y^2=90\r
\n" ); document.write( "\n" ); document.write( "solve the system by the substitution method \n" ); document.write( "

Algebra.Com's Answer #607917 by macston(5194) $\"\"$ $\"About$

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\n" ); document.write( " $\"y=x%5E2-10\"$
\n" ); document.write( " $\"y%2B10=x%5E2\"$ Use this to substitute for x^2.
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\n" ); document.write( " $\"9x%5E2-y%5E2=90\"$ Substitute for x^2.
\n" ); document.write( " $\"9%28y%2B10%29-y%5E2=90\"$
\n" ); document.write( " $\"9y%2B90-y%5E2=90\"$
\n" ); document.write( " $\"9y-y%5E2=0\"$
\n" ); document.write( " $\"y%289-y%29=0\"$
\n" ); document.write( " $\"y=0\"$ $\"OR\"$ $\"9-y=0\"$
\n" ); document.write( " $\"y=0\"$ $\"OR\"$ $\"9=y\"$
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\n" ); document.write( "For y=0:
\n" ); document.write( " $\"y=x%5E2-10\"$
\n" ); document.write( " $\"0=x%5E2-10\"$
\n" ); document.write( " $\"10=x%5E2\"$
\n" ); document.write( " $\"sqrt%2810%29=x\"$
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\n" ); document.write( "ANSWER 1: ( $\"%28plus_or_minus%29+sqrt%2810%29\"$ , $\"0%29\"$ )
\n" ); document.write( "For other answers, substitute 9 the same way.\r
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