y-intercepts in Real-World Problems Quick Check
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Question
The current temperature in degrees Celsius, where x equals the number of hours after noon, is 2x+10. Interpreting this equation, what is the initial value? (1 point)
Responses
2°C
2 degrees C
10°C
10 degrees C
−10°C
negative 10 degrees C
−2°C
negative 2 degrees C
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1 answer
The correct response is 10°C. The initial value, or y-intercept, is the value of the function when x is equal to 0. In this case, when x is 0, the temperature is 2(0) + 10 = 10°C.