The Abubakar family household uses 850 kWh of electricity per month (kWh stands for Kilowatt hour, a measure of electricity usage). They want to decrease their electricity usage, so they begin to decrease their usage by 25 kWh per month. The equation y = –25x + 850 can be used to model this scenario.

How many kWh of electricity will they be using 12 months after they've started doing this?