Hello, afeasfaerw23231233!

I got part (B ) . . .

Consider three points: .

is a line with slope passing through

is a line with slope passing through

and intersect at

(A) Find the equations of and

Ans: . . . . . Right!

(B) If is equidistant from and ,

prove that: .

The distance from a point to a line

. . is given by: .

We have the point

We want: .

has the equation: .

Hence: .

We want: .

has the equation: .

Hence: .

Since

Square both sides: .

Therefore: .