4. Using the given function: y=-3x' -8x +4x; x=1 a) Find the slope of the tangent line to the graph at the given value of x. [3] b) Find the equation of the tangent line. [3] 5. Let f(x) =5x -2x and g(x) =8x+3. Find the following: a) fig(3)] [3] b) g[f(3) ] [3]