What is the constant of proportionality of (perserved) 1. y=2.0+ 0.5x

2.y=75x
3.y=55x

4.y=320-15x

5. y= 15/60 x+30

6.y=2.25
7.y=5x+3

8.y=3-0.6x
9.y=15+ 1/2x
10.y=65x

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