Question 635131
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Hi,
Line Perpendicular to the graph of  y=1/3x+7; y-intercept (0,5)
New Line with slope m.  
Yes!  {{{m*(1/3) = -1}}},  m = -3
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 = -3x + 5       or in standard form: 3x-y = 5