the following questions: 1. Find the equation of the tangent line to a curve y = -x - 1 that is parallel to the line 2x + y = 6 2. Find the equation of the tangent line to the curve y = 1 - x that is parallel to the line 2x - 4y = 8 3. Find the equation of both the tangent line and the normal line of the curve f (x) = x + 3 at point (1, 4)