Answer:
{x,y} = {3/7,-43/7}
Step-by-step explanation:
System of Linear Equations entered :
[1] x + 3y = -18
[2] -x + 4y = -25
Graphic Representation of the Equations :
3y + x = -18 4y - x = -25
Solve by Substitution :
// Solve equation [1] for the variable x
[1] x = -3y - 18
// Plug this in for variable x in equation [2]
[2] -(-3y-18) + 4y = -25
[2] 7y = -43
// Solve equation [2] for the variable y
[2] 7y = - 43
[2] y = - 43/7
// By now we know this much :
x = -3y-18
y = -43/7
// Use the y value to solve for x
x = -3(-43/7)-18 = 3/7
Solution :
{x,y} = {3/7,-43/7}
Answer:
There were 423 adult tickets sold.
Step-by-step explanation:
Let x = the number of adult tickets sold
Let x + 65 = the number of student tickets sold
x + x + 65 = 715
2x = 715
x = 357.5
x + 65 = 422.5 (round up)
Answer:
Step-by-step explanation:
the answer stay the same due to the fact there are no like terms
7w+9+6x
Answer:
A!!!
Step-by-step explanation:
i just took the test
Answer:
![1679.60\ km^2](https://tex.z-dn.net/?f=1679.60%5C%20km%5E2)
Step-by-step explanation:
-We can use the exponential decay function to estimate the size after 13 years:
![P_t=P_oe^{-rt}](https://tex.z-dn.net/?f=P_t%3DP_oe%5E%7B-rt%7D)
Where:
is the size after t years, t is the time, r is the rate of decay and
the original size.
#We substitute and calculate as:
![P_t=P_oe^{-rt}\\\\=4600e^{-13\times 0.0775}\\\\=1679.60](https://tex.z-dn.net/?f=P_t%3DP_oe%5E%7B-rt%7D%5C%5C%5C%5C%3D4600e%5E%7B-13%5Ctimes%200.0775%7D%5C%5C%5C%5C%3D1679.60)
Hence, the forest covers
after 13 years.