The property management department will go to residents' homes to check the electricity meter every month. The difference between the reading of the electricity meter and the last reading is the kWh o

The property management department will go to residents' homes to check the electricity meter every month. The difference between the reading of the electricity meter and the last reading is the kWh of electricity used during this period. 1, electricity consumption last month =(n-300) kwh.

2、y=0.42×(n-300)=0.42n- 126

3. Constant:-126, 0.42

Variables: n, y

Y is a function of n.

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