Answer:
Part A: by finding equation and x value is size.
Take two coordinates: (20, 1/5), (40,2/5)
slope:
[tex]\frac{y2-y1}{x2-x1}[/tex]
[tex]\frac{\frac{2}{5} -\frac{1}{5} }{40-20}[/tex]
[tex]\frac{0.2}{20}[/tex]
[tex]0.01[/tex] ......this is slope, unit rate.
Equation:
y - y1 = m( x - x1 )
y - 1/5 = 0.01(x - 20)
y = 0.01x ........this is the equation
The y determines the size of kilowatts of energy
So y = 5
5 = 0.01x
x = 500 square feet
500 square feet is required to produce 5 kilowatts of energy.
