P3 circle Watch

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etomac
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#1
Report Thread starter 14 years ago
#1
y=mx is a tangent to circle x^2+y^2-6x-6y+17=0
whats the possible values of m
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john !!
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#2
Report 14 years ago
#2
substitute mx into the second equation
simplify to form a quadratic in x, treating m as a constant
put b^2 - 4ac = 0 (the discriminant .. indicates two equal roots, ie. touching the circle)
from there I think simultaneous equations will give you the two values for m.
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