document.write( "Question 179767This question is from textbook Algebra 1
\n" ); document.write( ": i do not understand how to solve this problem y=x-9 x+8y=0 \n" ); document.write( "

Algebra.Com's Answer #134685 by Mathtut(3670) $\"\"$ $\"About$

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you can solve it by a number of methods such as substitution or elimination
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\n" ); document.write( "I will use substution for this problem
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\n" ); document.write( "y=x-9.........eq 1
\n" ); document.write( "x+8y=0........eq 2
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\n" ); document.write( "take the value of y from eq 1 which is x-9 and plug that into eq 2 for every occurrence of y
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\n" ); document.write( "x+8(x-9)=0
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\n" ); document.write( "x+8x-72=0
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\n" ); document.write( "9x=72
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\n" ); document.write( "now take x's found value and plug that into eq 1 or eq 2. Both will yield the same answer when solving for y. I choose eq 1
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\n" ); document.write( "y=8-9=-1
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\n" ); document.write( "solution:(8,-1)
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\n" ); document.write( "If you plug those values into either equation they will be a solution. \n" ); document.write( "

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