4x + 5y = 5 / (-1)
8x + 5y = 25
-4x - 5y = -5
8x + 5y = 25
-4x + 8x = -5 + 25
4x = 20
x = 5
4x + 5y = 5
4*5 + 5y = 5
20 + 5y = 5
5y = 5 - 20
5y = -15
y = -3
8x + 5y = 25
8 *5 + 5y = 25
40 + 5y = 25
5y = 25 - 40
5y = -15
y = -3
Answer:
The value of r is 0.451
The percentage decrease is about 45.1%
Step-by-step explanation:
The given exponential function is
Using the exponent rule,
Now the value of
Thus, we can rewrite the function as
Therefore, the function in form
The value of r is 0.451
The percentage decrease is about 0.451 ×100 = 45.1%