Evaluate the line integral integral from upper c to font size decreased by 10 gradient phi times d bold r for the following function phi and oriented curve c in two ways.

(a) use a parametric description of c and evaluate the integral directly.
(b) use the fundamental theorem of line integrals. phi(x, y)equalsx plus 3 y; c: r(t)equalsleft angle 4 minus t comma t right angle, for 0less than or equalstless than or equals4