document.write( "Question 443693: solve and graph. -3x-9y=18 \n" ); document.write( "

Algebra.Com's Answer #305974 by oberobic(2304) $\"\"$ $\"About$

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-3x -9y = 18
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\n" ); document.write( "Reorganize to point-slope format: y = mx +b.
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\n" ); document.write( "Add 3x to both sides
\n" ); document.write( "-9y = 3x + 18
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\n" ); document.write( "Divide both sides by -9.
\n" ); document.write( "y = -(3/9)x + 18/-9
\n" ); document.write( "y = -(1/3)x - 2
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\n" ); document.write( "To graph you need two points, since this is a linear equation.
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\n" ); document.write( "If x=0, y = -2: (0,-2)
\n" ); document.write( "if y=0, x = -6: (-6,0)
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\n" ); document.write( " $\"graph%28500%2C500%2C-10%2C10%2C-10%2C10%2C-1%2F3%2Ax+-2%29\"$
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\n" ); document.write( "You can inspect the answer to increase your confidence you are right.
\n" ); document.write( "The slope of -1/3 means the line goes down to the right. (It does.)
\n" ); document.write( "The slope of -1/3 means that for every change of 3 along x, there is -1 change along y-axis. (Check)\r
\n" ); document.write( "\n" ); document.write( "Done. \n" ); document.write( "

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