Can't find the equation of the tangent line of the graph at (-4, -8/5)

Let f(x) = x -6 (a) Find the slope of the tangent line for the function f(x) at the point (-4, -;). (Use symbolic notation and fractions where needed.) slope: (b) Find an equation of the tangent line to the graph of the function f(x) at the point (-4, - ). (Use symbolic notation and fractions where needed. Let y = f(x) and give the equation in terms of y and x.) equation: x - 6