Question

An electric company charges a certain rate per kilowatt-hour (\text{kWh})(kWh) of electricity used and an administrative fee of \$3.50$3.50. The company charged Zhao \$63.25$63.25 for using 800\,\text{kWh}800kWh of electricity. Zhao uses the equation, 63.25=800r+3.5063.25=800r+3.50 to represent the situation. What does the variable rr represent in the equation

Answer 1

the charge per kilo-watt hour

Explanation:

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Answer 2

r represents the rate the electric company charges per kilowatt-hour.

Explanation:

r represents the rate the electric company charges per kilowatt-hour.

Total charged to Zhao was 63.25 out of which 3.50 is administrative charge (fixed).

• Total charge consists of "administrative charge" + "charge per kilowatt hours*hours used
• The equation is given as 63.24 = 3.5 + 800r

Matching the "word equation" with "mathematical equation", we see that 800 is the hours used and r is the charge per kilowatt hour.