For each problem, find the equation of the line tangent to the function at the given point. Your answer should be in slope-intercept form. 7) (x) = x + 2x + 4 at (2, 8) f(x) = x - x +3 at (-1, 1) 9) (x) = 2x + 8x +6 at (3, 0) 10) f(x) = x - 3x + 4 at (1, 2)