Respuesta :
I believe your answer to this, would have to be D. y=2x-8, because since it changes 2 degrees each hour, and the degrees is at -8 degrees that morning, I would presume that it would still be cold. So, the answer would be y=2x-8 showing 2x - (-8).
If we read this problem carefully, it becomes obvious that there's an initial temperature (vertical intercept) of -8 degrees F, and that there's also an hourly increase in the temperature. Thus, the slope-intercept model is called for:
y = mx + b. m is the slope and in this problem is +2 degrees F per hour, and b is the y-intercept, -8 degrees F. The variable x represents the number of hours that have passed since the first (-8 degree) measurement was taken:
T(x) = -8 degrees F + (+2 degrees F per hour)(x), where x is measured in hours.
The best fit to this is the fourth answer choice, y = 2x-8.