Question 656763
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Hi,
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.
x + 2y = 3   0r   y = (-1/2)x + 3/2,   m = {{{-1/2}}}
slope of a line <u>perpendicular</u> to that line is {{{highlight(2)}}}