questions linear

Use the tangent plane to approximate a function of two variables at a point. Find the linear approximation to the equation f(x, y) = 3, cy at the point (4, 8, 6), and use it to 8 approximate f(4.13, 8.11). f(4.13, 8.11) ~ Make sure your answer is accurate to at least three decimal places, or give an exact answer. Question Help