mathsurgently needed
posted by Anonymous .
A line through through the point (3,0) meet the variable line y=tx at right angle at the point P.
Find in terms of t, the coordinates of P

P has coordinates (x,tx)
The line from (3,0) to P has slope 1/t
now, drop an altitude from P to the xaxis.
tx/(x3) = 1/t
x = 3/(1+t^2)
P = (3/(1+t^2), 3t/(1+t^2)) 
line 1: y=tx
line 2: y=x/t +b
but you know point 3,0 is on line 2
0=3/t + b or b=3/t
line2: y=x/t +3/t
line1 y=tx
set them equal
tx=x/t+3/t solve for x
then solve for y. 
Thank u so much @steve and @bobpursley
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