xy = -1
x + y = 2
x + y = -2
- x - x
y = -x - 2
xy = -1
x(-x + 2) = -1
x(-x) + x(2) = -1
-x² + 2x = -1
+ 1 + 1
-x² + 2x + 1 = 0
-1(x²) - 1(-2x) - 1(-1) = 0
-1(x² - 2x - 1) = 0
-1 -1
x² - 2x - 1 = 0
x = -(-2) ± √((-2)² - 4(1)(-1))
2(1)
x = 2 ± √(4 - 4(-1))
2
x = 2 ± √(4 + 4)
2
x = 2 ± √(8)
2
x = 2 ± 2√(2)
2
x = 1 ± √(2)
x + y = 2
(1 ± √(2)) + y = 2
- (1 ± √(2)) - (1 ± √(2))
y = 1 ± √(2)
(x, y) = (1 ± √(2), 1 ± √(2))
The numbers that multiply to -1 and add to 2 are 1 ± √(2).
Answer:
8 hours.
Step-by-step explanation:
The initial water level is 24.8 meters, and the rate of water level drop is 2 meters/ hour, that means after 
hours the water level 
will be
Now we want water level to be 8.8 meters, I.e 
, therefore, we have:
we solve the equation for :
it will take 8 hours for the water level to drop to 8.8 meters.
Answer= 2w2-9w-5
Hope this helps
Answer:
The linear relationship ( the linear equation ):
y = m x + b ( the slope-intercept form )
m = ( 50.75 - 42.25 ) / ( 5 - 3 ) = 8.50 / 2 = 4.25 ( the slope )
42.25 = 4.25 * 3 + b
b = 42.25 - 12.75
b = 29.50
y = 4.25 * x + 29.50
Answer:
The initial value is : ( 0, 29.50 ) or 29.50.
The answer is C because it is on the x axis and it is positive
