Question 1134410
Given y=-2x-1,

slope = -2     (simply the coefficient of x)

Slope of the line that is perpendicular to that:

Negative reciprocal of -2 = {{{1/2}}}

{{{y=(1/2)x+b}}}               Substitute (2,1) to find b
{{{1=(1/2)(2)+b}}}
{{{b=0}}}

Therefore, the equation of the line is

{{{y=(1/2)x}}}


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