# y = mx + b models the value, y, of a new car x years after the initial purchase in 2017. Would you expect m to positive, negative, or zero?

A formula in the form y = mx + b models the value, y, of a new car x years after the initial purchase in 2017. Would you expect m to positive, negative, or zero? the answer must be explained in detail using correct vocabulary. Please help me

### 2 Answers

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- PuzzlingLv 74 weeks ago
In general, cars depreciate in value (meaning they go down in value after purchase). So we would expect the slope of the line to be negative. A negative slope has a *decrease* in y for each *increase* in x.

So it goes down in value (y) each additional year (x) that you own the car.

- 4 weeks ago
Do you expect the value of the car to increase or decrease over time?

Over time, cars are worth less than initial purchase. So you would see a decrease in worth, y. This means the slope, m, will be negative.

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