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Are the pair of lines parallel, perpendicular, or neither?
\n" ); document.write( "5x+3y=4
\n" ); document.write( "3x-5y=9\r
\n" ); document.write( "\n" ); document.write( "if lines parallel --> slopes equal
\n" ); document.write( "if lines perpendicular --> slopes are negative reciprocals
\n" ); document.write( "(for example if one slope is 1/3 the other slope would be -3)
\n" ); document.write( "converting to slope-intercept form of y=mx+b, where m is the slope, and b is the y-intercept (vertical-intercept or the point (0,b)
\n" ); document.write( "first line:
\n" ); document.write( "5x + 3y = 4
\n" ); document.write( "3y = -5x + 4
\n" ); document.write( "y = (-5/3)x + 4/3
\n" ); document.write( "second line:
\n" ); document.write( "3x - 5y = 9
\n" ); document.write( "-5y = -3x + 9
\n" ); document.write( "y = (3/5)x - 9/5
\n" ); document.write( "slopes are -5/3 on one, and 3/5 on the other, the lines are perpendicular
\n" ); document.write( " \n" ); document.write( "