18 - Co ordinate Geometry Questions Answers

$$\begin{gathered} Let the lines in the pair are m_{1}x-y=0 and m_{2}x-y=0 \\ Find perpendiculars from (x^{,},y^{,}) on lines and calculate their sum \\ Use formulae m_1+m_2 = -\frac{2h}{b} and m_1{m}_2= \frac{a}{b} \end{gathered}$$Inform for any issue

sovle the two eqs for x and y,

method : 

x^2 + y^2=12 

on putting this in 2nd eq. we get -5x+3y = -10 so x = (3y+10)/5

so [(3y+10)/5]² + y²= 12

now get y then x, then get the tangents in the first circle and then intersection point of the tangents.

for 2<x<4,   f(x) = x-2

so g(x) = f(x-2) = x-2-2 = x-4

so g'(x) = 1