Answer:
<em>D. y=-3x</em>
Step-by-step explanation:
<u>Direct Proportion</u>
A direct proportion is a relation between variables where their ratio is a constant value. This means that if y and x are proportional, then:

Where k is the constant of proportionality.
Solving for y:
y=kx
The only choice representing a direct proportion is:
D. y=-3x
Answer:
total area=lb=
where l=8x-10
b=2x+2x=4x
area=4x(8x-10)=32x^2-40x..........(1)
now..area of hot tub=x^2=lb
area of pool=lb=2x(6x-14)=12x^2-28x
area of patio = total area - area of hot tub and pool
A=32x^2-40x-x^2-12x^2+28x=(19x^2-12x) feet.....ans