$2$ Maximum and Minimum Yearly Temperatures in Doylestown

The image below shows the maximum and minimum yearly temperatures in the town of Doylestown $($PA$),$ as recorded by the local airport weather station. In the graph the vertical $y-$axis shows the temperature in degrees Celsius, while the horizontal $x-$axis shows the time in years $($elapsed since $2000,$ so the year $2000$ corresponds to $x=0$ in the graph$).$ In the graph, yellow datapoints correspond to maximum yearly temperatures, while the blue datapoints correspond to the minimum yearly temperatures. The lines of best fit are graphed together with the data: the equation for one line is

$y=-0\mathrm{.}01x+35\mathrm{.}3$

while the equation for the other is

$y=0\mathrm{.}14x+12\mathrm{.}7$

$(y$ measures temperature in Celsius, while $x$ measures time and is given in "years since $2000$

Annotate each graph by writing the correct equation on top of each line of best fit. You must explain the logic of your choice $[1$ point$]$

Is the maximum yearly temperature in Doylestown increasing, or decreasing or staying roughly constant? Why do you think so$?[1$ point$]$

Is the minimum yearly temperature in Doylestown increasing, or decreasing or staying roughly constant? Why do you think so$?[1$ point$]$

In a subtropical climate there is not much difference between maximum and minimum yearly temperatures. Let's define a subtropical climate as a climate where there is no difference between maximum and minimum yearly, so that $T_{\text{m}\text{a}\text{x}}=T_{\text{m}\text{i}\text{n}}.$ Use the lineas of best fit provided to estimate the year when Doylestown will have a subtropical climate. Explain the logic of your answer.$[2$ point$]$

Min Yearly Temp $($Celsius$)$

Max Yearly Temp $($Celsius$)$