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andre [41]
3 years ago
13

Solve the following system using the Substitution method:

Mathematics
1 answer:
Liono4ka [1.6K]3 years ago
6 0

<u>Answer:</u>

(x, y) = (-2, 2)

<u>Step-by-step explanation:</u>

We are given the following two equations which we are to solve using the substitution method:

x - y = -4 --- (1)

x - 2y = -6 --- (2)

From equation (1):

x = y-4

Substituting this value of x in (2) to get:

x = [tex]x - 2y = -6\\\\(y-4)-2y=-6\\\\-y=-6+4\\\\-y=-2[/tex]

y = 2

Substituting the value of y in (1) to get x:

x - y = -4

x - 2 = -4

x = -4 + 2

x = -2

Therefore, (x, y) = (-2, 2).

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g In American roulette, the wheel has the 38 numbers, 00, 0, 1, 2, ..., 34, 35, and 36, marked on equally spaced slots. If a pla
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Answer:

The expected value for the player to play one time is -$0.05.

Step-by-step explanation:

The expected value of a random variable <em>X</em> is given by the formula:

E(X)=\sum x\cdot P(X)

The American roulette wheel has the 38 numbers, {i = 00, 0, 1, 2, ..., 34, 35, and 36}, marked on equally spaced slots.

The probability that the ball stops on any of these 38 numbers is same, i.e.

P (X = i) = \frac{1}{38}.

It is provided that a a player bets $1 on a number.

If the player wins, the player keeps the dollar and receives an additional $35.

And if the player losses, the dollar is lost too.

So, the probability distribution is as follows:

<em>     X </em>: $35      -$1

P (<em>X</em>) :   \frac{1}{38}         \frac{37}{38}  

Compute the expected value of the game as follows:

E(X)=\sum x\cdot P(X)

         =[\$35\times \frac{1}{38}]+[-\$1\times \frac{37}{38}]\\\\=\frac{\$35-\$37}{38}\\\\=-\frac{\$2}{38}\\\\=-\frac{1}{19}\\\\=-0.052632\\\\\approx -\$0.05

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2x=-9-1y

x=-(9+1y)/2

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