Hi,         

the standard slope-intercept form for an equation of a line: y = mx + b  

where m is the slope and b the y-intercept.  

Determining if lines are perpendicular.  that is: slopes being negative reciprocals.

 y= 6x-9  Slope of this line = 6 (line prependicular, would have slope -(1/6)

 5y=9-x

  y = -x/5 + 9/5  Slope of this line is -(1/5) 

Lines are not perpendicular to one another on a graph

 

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