Javier K.

asked • 06/09/20

A mathematical model in the form y = mx + b models the cost, y, of a four year college degree x years after 2010. What would the y intercept represent? Explain.

I realize y is cost, x is years, and I'd imagine b is the constant and would be somehow representative of 2010. How do I find the y intercept here?

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Arturo O. answered • 06/09/20

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The y-intercept b is the value of y when x = 0, so the point is (0,b). In this problem, b is the cost associated with the year 2010.

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Javier K.

Ok, understood. So the y-intercept is representative of when they began to model, so in this case 2010? Thank you for your assistance!
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06/09/20

Arturo O.

Correct. 2010 is year zero in this model. So if you want to input a year for x, for example year 2018, first subtract 2010, and input that. x=2018-2010 = 8.
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06/09/20

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