document.write( "Question 450142: I would like to know how to determine if the 2 lines are parallel, perpendicular or neither, how do I apply the formula, I always forget;\r
\n" ); document.write( "\n" ); document.write( "4x+8y=16
\n" ); document.write( "3x+6y=7 \n" ); document.write( "
Algebra.Com's Answer #309684 by Alan3354(69443)\"\" \"About 
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I would like to know how to determine if the 2 lines are parallel, perpendicular or neither, how do I apply the formula, I always forget;\r
\n" ); document.write( "\n" ); document.write( "4x+8y=16
\n" ); document.write( "3x+6y=7
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\n" ); document.write( "Solve for y
\n" ); document.write( "4x+8y=16
\n" ); document.write( "y = (-1/2)x + something
\n" ); document.write( "Slope = -1/2
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\n" ); document.write( "3x+6y=7
\n" ); document.write( "y = (-1/2)x + something
\n" ); document.write( "Slope = -1/2
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\n" ); document.write( "The slopes are equal, -1/2, so they're parallel.
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\n" ); document.write( "PS The \"somethings\" are the y-intercepts. They're not relevant in finding the slopes, but if they're equal, then it's the same line.
\n" ); document.write( "That's called the slope-intercept form, y = mx + b
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