Mr. and Mrs. Smith started walking home from different locations at the same time. They each walked at a constant speed. Mr. Smith's distance (in kilometers) from home as a function of time (in minutes) is given by the following table of values:

Find the directions in which the function increases and decreases most rapidly at upper p 0p0. then find the derivatives of the function in these directions. f(x,y)equals=x squared plus xy plus y squaredx2+xy+y2, upper p 0p0left parenthesis 1 comma negative 4 right parenthesis