Answer: the option A.

The elimination method consist is adding the two equations in a way that one variable be eliminated..

In order to do that you might have to manipulate on of the equations prior to add the two equations.

In this case, ff you multiply the second equation by - 1 you will get

- x - y = - 4

which you can add to the first equation

2x + y = 8 to eliminate the y.

4 0

3 years ago

If A and B are independent events and P(A) and P(B) are both greater than 1/2

elixir [45]

Answer:

P(A and B) is greater than 1 is never happened ⇒ C

Step-by-step explanation:

Two events are independent if the result of the second event is not affected by the result of the first event

If A and B are independent events, the probability of both events is the product of the probabilities of the both events P (A and B) = P(A) · P(B)

∵ The probability of any event is less than 1

∵ P(A) < 1

∵ P(A) > $\frac{1}{2}$

- That means P(A) is greater than half and less than 1

∴ $\frac{1}{2}$ < P(A) < 1

∵ P(B) < 1

∵ P(B) > $\frac{1}{2}$

- That means P(B) is greater than half and less than 1

∴ $\frac{1}{2}$ < P(B) < 1

∵ P(A and B) = P(A) . P(B)

- Remember the product of any fractions less than 1 is less than 1

∴ $\frac{1}{4}$ < P(A) . P(B) < 1

- That means any expression equals to P(A) . P(B) must be greater

than $\frac{1}{4}$ and less than 1

∴ $\frac{1}{4}$ < P(A and B) < 1

∴ P(A and B) is greater than 1 is never happened

7 0

3 years ago

Use the graph at the right to determine whether each system has no solution, one solution, or infinitely many solutions.

Fynjy0 [20]

The answer 4.4 I just did it on edge

6 0

3 years ago