IDNStudy.com, ang iyong mapagkukunan para sa mabilis at maaasahang mga sagot. Makakuha ng mga sagot sa iyong mga tanong mula sa aming mga eksperto, handang magbigay ng mabilis at tiyak na solusyon.

ANALYTIC GEOMETRY (Conic Section; Parabola)

Find the equation of the line tangent to y^2=-16x and parallel to x+y=1.




Sagot :

m = -1 since it is parallel to the given line. Since the equation for the slope of the tangent line its derivative, then dy/dx = m = -1

dy/dx = -8/y = -1
y = 8
Substituting y to the eq of parabola, we will get x = -4

The tangent line passes through point (-4, 8)
 
Using point-slope formula, we have
y-8 = -1(x+4)

Therefore, the equation of the tangent line is y = -x + 4