3. Consider the equation 300ry - 5y* +90(x + 1)? = 28016 (a) Verify that the point (1, 4) lies on the graph of 30013y - 5y* + 90(z + 1)? =. 2802 (b) Find the slope of the tangent line to 300x3y - 51* + 90(r + 1)? = 280r at the point (1, 4)