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At night, the temperature in the Sahara Desert drops very quickly. The temperature drops by 0.85 degrees every minute after sunset. If the temperature started at 99 degrees, which equation describes this scenario after [tex]\( x \)[/tex] minutes have passed?

A. [tex]\( y = 99 - 0.85x \)[/tex]
B. [tex]\( y = -85x + 99 \)[/tex]
C. [tex]\( y = 0.85x + 99 \)[/tex]
D. [tex]\( y = -99x + 0.85 \)[/tex]

Sagot :

GinnyAnswer
To solve this problem, we need to determine how the temperature changes in relation to the number of minutes after sunset.

1. Understand the Variables:
- [tex]\( y \)[/tex] represents the temperature after [tex]\( x \)[/tex] minutes have passed.
- [tex]\( x \)[/tex] represents the number of minutes after sunset.
- The initial temperature at sunset is 99 degrees.
- The temperature drops by 0.85 degrees every minute.

2. Set up the Linear Equation:
- Initially (at [tex]\( x = 0 \)[/tex]), the temperature is 99 degrees. So, when [tex]\( x = 0 \)[/tex], [tex]\( y = 99 \)[/tex].
- The temperature decreases by 0.85 degrees per minute. This means for each minute that passes, 0.85 degrees is subtracted from the initial temperature.

3. Formulate the Equation:
- Starting with the initial temperature and subtracting the decrease per minute, the equation can be formed as:
[tex]\[ y = 99 - 0.85x \][/tex]
- Here, [tex]\( 99 \)[/tex] is the starting temperature, and [tex]\( -0.85x \)[/tex] represents the decrease in temperature over [tex]\( x \)[/tex] minutes.

4. Choose the Correct Equation from the Given Options:
- The correct linear equation based on the above formulation is:
[tex]\[ y = 99 - 0.85x \][/tex]

5. Analyze Given Options:
- Let's compare the provided options:
1. [tex]\( y = -99x - 0.85 \)[/tex] is incorrect because it incorrectly represents the rate and initial temperature.
2. [tex]\( y = -85x + 99 \)[/tex] is incorrect because it inaccurately represents the rate and does not include the correct coefficient for the temperature drop.
3. [tex]\( y = 0.85x + 99 \)[/tex] is incorrect because it suggests the temperature increases instead of dropping.
4. [tex]\( y = -99x + 0.85 \)[/tex] is incorrect as it misrepresents both the initial temperature and drop rate.

Since none of the provided options match exactly as discussed in our correct formulation, by the process of elimination and check, the closest or intended option representing the scenario while acknowledging possible error in transcriptions in the question posed:

The correct description is best mapped to option 4.
[tex]\[ y = -99x + 0.85 \][/tex]
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