Determine the equation of both lines that are tangent to the graph of y=x^2 +4 and pass through the point (1,-2)

So would I simply use the y=mx+b form, m=2, y= -2, and x = 1?

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- Mar 21st 2010, 04:43 PMRyGuyFind the equation of both lines?
Determine the equation of both lines that are tangent to the graph of y=x^2 +4 and pass through the point (1,-2)

So would I simply use the y=mx+b form, m=2, y= -2, and x = 1? - Mar 21st 2010, 04:47 PMskeeter
- Mar 21st 2010, 04:50 PMRyGuy
- Mar 21st 2010, 04:57 PMArchie Meade
- Mar 21st 2010, 05:05 PMskeeter
point of tangency on the curve is

each tangent line passes thru the point

remember how to find the slope between two points?

... also, note that the slope of both tangent lines is y' = 2x

I'll let you take it from here.