At 7:00 a.m. the temperature outside was 56°F. By 11:00 a.m., the temperature had risen to 72°F. Which equation models the temperature y at time x?

a. y= 4x - 28

b. y= -4x - 28

c. y= -4x + 28

d. y= 4x + 28

Slope is found by rise over run. The temperature rose 16 degrees in 4 hours; 16/4=4 slope.

B (y intercept) is found at time zero. 56-4(7) gives a temperature at midnight gives a positive 28 degrees.

D. Y=4x+28

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