Question 982781
The line is a variable point  (3,y).


Use the distance formula for the two points  (3,y) and (2,-5).
{{{sqrt((3-2)^2+(y-(-5))^2)=3.5}}}


{{{sqrt(1+(y+5)^2)=3.5}}}

{{{1+(y+5)^2=12.25}}}

{{{(y+5)^2=11.25}}}-----NOT necessary to multiply the squared binomial


{{{y+5=0+- sqrt(11.25)}}}


{{{highlight(y=-5+- sqrt(11.25))}}}-------The two possible y-coordinates; you could put into simplest radical form if needed