What is the function form for 9y-4x-9=0

Find the value of x that will make l ll m

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

Def rotates 90 clockwise about point a to create d’ e’ f’. therefore, which equation must be true ?