Wren recorded an outside temperature of –2°F at 8 a.m. When she checked the temperature again, it was 4°F at 12:00 p.m. If x represents the time and y represents the temperature in degrees Fahrenheit, what is the slope of the line through these two data points?

The two points are (8, –2) and (12, 4), where x is time in hours and y is temperature. The slope is the change in temperature divided by the change in time: (4 – (–2)) ÷ (12 – 8) = 6 ÷ 4 = 1.5. The slope is 1.5°F per hour, choice D.

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