Biology/Maths help!

[Jakerm1995]

I have two line equations representing two temperatures:

Temperature 25C: y= 0.7479x + 0.6586
Temperature 33C: y= 1.050x + 1.601

I am tasked with using these to work out the difference in development rates of a particular species under each temperature. Y= development time and x=Time. I am confused with how to use these two equations to calculate the difference in growth rate. As when I apply a percentage increase calculation to temperature 33, I calculate an 87% increase over 10 hours, and with the 25C i see a 92% increase over 10 hours. It should be that the 33C has a higher development rate and so my calculations must be wrong 😕 I am very confused. Any suggestions are much appreciated (bare in mind, I am a noob at maths). I have attached an image of the graph i've made using Rstudio, as well as the question being asked. 
 

"You should use your two line equations to work out the difference in development (in standard developmental hours) at a certain time (actual hours) between the two temperatures.  If you do this for 24h (actual time = x value), then you already have a value of developmental hours/day. From then you just need to factor in the temperature difference as well to get a final value in  h/°C/day."

Thanks a lot!
 

Edited March 3, 2022 by Jakerm1995

[Genady]

1 hour ago, Jakerm1995 said:

As when I apply a percentage increase calculation to temperature 33, I calculate an 87% increase over 10 hours, and with the 25C i see a 92% increase over 10 hours. It should be that the 33C has a higher development rate and so my calculations must be wrong 😕

If you show how you get to these numbers maybe we can see where the mistake is...

[Genady]

5 minutes ago, Rodolfo Hale said:

In the mathematical question, two-line equations are in question. These equations represent two different temperatures.
He uses these two equations to find the difference between the development rates of a particular species by using specific temperatures and time. How are these temperatures used for the difference between the growth rates? The questioner is confused. He wants some suggestions to solve this complicated question. He attaches an image of the graph and the problem to solve this question. When he applies a percentage to increase the temperature, he calculates a 92% increase in temperature in a specific time. The temperature increased 92% over 10 hours.
He says that to solve these mathematical equations, you should use the two-line equations of two certain temperatures to find out the difference in development rates at a specific time. He applies a percentage to increase the temperature, calculating an 87% increase. It has a higher development rate.
 

How do you know that they are "he"?