Question 612457
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Hi, 
Determine whether the graphs of the two equations are perpendicular.
Using the standard slope-intercept form for an equation of a line y = mx + b
  where m is the slope and b the y-intercept. 
 y={{{highlight(3)}}}x-9
7y=9-x OR y = {{{highlight(-1/7)}}}x + 9/7
NO: slopes are NOT negative reciprocals of one another