Question

Charlotte is preheating her oven before using it to bake. Charlotte wants to predict the final temperature after xx minutes. She wrote the equation y=78+20x, where yy represents the final temperature in degrees Fahrenheit. What is the meaning of the yy-value when x=1?The change in minutes for every change of one degree Fahrenheit.The oven's temperature after 1 minute.The change in degrees Fahrenheit for every change of one minute.The time when the oven's temperature is 0∘ .

Answer 1

Given that the temperature after x minutes is represented by the equation:

`\begin{gathered} y=78+20x \\ where \\ y\Rightarrow final\text{ temperarure in degree fahrenheit} \\ x\text{ }\Rightarrow time\text{ in minutes} \end{gathered}`

When x=1, we have

`\begin{gathered} y=78+20x \\ where \\ x=1 \\ thus, \\ y=78+20(1)=78+20 \\ \Rightarrow y=98 \end{gathered}`

The y-value represents the oven's temperature after 1 minute.