document.write( "Question 933896: Determine whether the graphs of 2x+y=-9 and -4y=-2x+7 are parallel, perpendicular, or neither \n" ); document.write( "

Algebra.Com's Answer #567134 by rothauserc(4718) $\"\"$ $\"About$

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we are given
\n" ); document.write( "2x +y =-9
\n" ); document.write( "-4y =-2x + 7
\n" ); document.write( "next put each equation in standard form, y = mx + b
\n" ); document.write( "y = -2x -9
\n" ); document.write( "y = x/2 - 7/4
\n" ); document.write( "the slope of these two lines is the negative reciprocal of the other, the lines are perpendicular
\n" ); document.write( "here is their graph
\n" ); document.write( " $\"+graph%28+300%2C+200%2C+-10%2C+10%2C+-10%2C+10%2C+-2x-9%2C+x%2F2+-+7%2F4%29+\"$
\n" ); document.write( " \n" ); document.write( "

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