Question 528567
write a formula that expresses the relationship P varies jointly as x and y 
:
Let k = the the constant of variation
P = xyk
:
and P=8 when x=3 and y=-10
8 = 3*-10*k
find k
8 = -30k
k = {{{8/(-30)}}}
k = -.267
:
P = -.267xy is the formula