(a)

The linear equation that relates the monthly charge in $\"\"$ , in dollars, to the number $\"\"$ of kilo-watt hours used in a month, $\"\"$ .

Charge = usage + monthly charge.

$\"\"$ , $\"\"$ .

(b)

Graph of the equation $\"\"$ , $\"\"$ .

(c)

Find the monthly charge for using 200 kilowatt-hours.

Substitute $\"\"$ in $\"\"$ .

$\"\"$

The monthly charge for using 200 kilowatt-hours is $22.65.

(d)

Find the monthly charge for using 500 kilowatt-hours.

Substitute $\"\"$ in $\"\"$ .

$\"\"$

The monthly charge for using 500 kilowatt-hours is $48.09.

(e)

The linear equation $\"\"$ .

Slope of the linear function is 0.0848.

Each additional kW-hr used adds $0.0848 to the bill.

(a).The linear equation $\"\"$ , $\"\"$ .

(b). Graph of the equation $\"\"$ , $\"\"$ .

(c). The monthly charge for using 200 kilowatt-hours is $22.65.

(d). The monthly charge for using 500 kilowatt-hours is $48.09.

(e). Each additional kW-hr used adds $0.0848 to the bill.