Answer:
![y(x) = e^{3x} [Acos x+Bsin x]](https://tex.z-dn.net/?f=y%28x%29%20%3D%20e%5E%7B3x%7D%20%5BAcos%20x%2BBsin%20x%5D)
Step-by-step explanation:
Given is a differential equation

We have characteristic equation as

The above quadratic cannot be factorised hence use formula

Hence general solution would be
![y(x) = e^{3x} [Acos x+Bsin x]](https://tex.z-dn.net/?f=y%28x%29%20%3D%20e%5E%7B3x%7D%20%5BAcos%20x%2BBsin%20x%5D)
27.5 Gallons of gas was used by two cars.
Hope this help if not i'm sorry.
Answer: The height of fir tree is 9 meters and the height of pine tree is 12 meters.
Step-by-step explanation:
Given : The combined height of one fir tree and one pine tree = 21 meters.
Since, the height of 4 fir trees stacked on top of each other is 24 meters taller than one pine tree.
Let x be the height of fir tree and y be the height of pine tree.
Then we get the following equations:

Adding (1) and (2) we get

Substitute the value of x in (1), we get

Hence, the height of fir tree is 9 meters and the height of pine tree is 12 meters.
3v-9v is -6v
-6v=30 Divide each side by -6
v=-5
To check: substitute -5 back into the equation wherever you see v
3(-5)-9(-5)=30
-15+45=30
30=30
It's going to be a positive slope line so I would say from left to right top left to bottom right. Good luck!