document.write( "Question 720757: 1. How do you plot x = 2y, y = x + 2, y = 2x and y = x ÷ 2 on a graph.\r
\n" ); document.write( "\n" ); document.write( "Which one of the above formulas describes a line.
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Algebra.Com's Answer #441945 by josmiceli(19441) $\"\"$ $\"About$

You can put this solution on YOUR website!
They all describe straight lines
\n" ); document.write( "To see this, put them all into the
\n" ); document.write( "slope-intercept form
\n" ); document.write( "(1) $\"+x+=+2y+\"$
\n" ); document.write( "(1) $\"+y+=+%281%2F2%29%2Ax+\"$
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\n" ); document.write( "(2) $\"+y+=+x+%2B+2+\"$ ( don't have to change )
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\n" ); document.write( "(3) $\"+y+=+2x+\"$ ( don't have to change )
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\n" ); document.write( "(4) $\"+y+=+%281%2F2%29%2Ax+\"$ ( same as (1) )
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\n" ); document.write( "These all have the form $\"+y+=+m%2Ax+%2B+b+\"$ ,
\n" ); document.write( "where $\"m\"$ = slope and $\"b\"$ = y-intercept
\n" ); document.write( "For (1) and (3), $\"+b+=+0+\"$
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\n" ); document.write( "Since 2 are the same, there is only 3 lines:
\n" ); document.write( " $\"+graph%28+400%2C+400%2C+-5%2C+5%2C+-5%2C+5%2C+%281%2F2%29%2Ax%2C+x%2B+2%2C++2x+%29+\"$
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