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Marat540 [252]
4 years ago
10

Please Help Me! Math Question!

Mathematics
2 answers:
Mekhanik [1.2K]4 years ago
7 0
To solve this pair of equations, by using the substitution method, all you have to do is simply choose 1 equation and simply solve for any variable X and or y. Then solve for the other equation, by plugging in the equation.

Y = X + 4
Y = -2x - 2

X + 4 = -2x - 2
0 = -3x - 6
-3x = 6
X = -6/3
X = -2.

Y = X + 4
Y = -2 + 4
Y = 2.

P(-2,2). The following point would be the solution to the equation.
adoni [48]4 years ago
3 0
This will be simple since They are both solved for Y. :) put them across from each other (in parenthesis if you want to show which one was substituted). So we have ( x + 4 )= -2x - 2. Next subtract the 4 from both sides and add 2x to each side. Now we have 3x = -6. Divide by 3 and get X=-2. Plug X into an original equation and solve for Y. y = (-2) + 4. Y=2                           (2, 2)
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Maggie's brother is 6 years younger than four times her age. The sum of their ages is 39. How old is Maggie?
poizon [28]

We can set Maggie's age to x

If her brother is six years younger than four times her age, than her brother must be equal to: 4x-6

Since the sum of their ages is 39, we can set up an equation.

(Sum of Maggie's age) + (sum of Maggie's brother's age) = 39

x + (4x -6) = 39

5x -6 = 39

5x = 45

x = 9 , Maggie's age is 9

6 0
3 years ago
The phone lines to an airline reservation system are occupied 45% of the time. Assume that the events that the lines are occupie
dimaraw [331]

Answer:

0.1569 = 15.69%

Step-by-step explanation:

If eight calls were placed, and we need to know the probability of exactly two calls were occupied, we need to calculate a combination of 8 choose 2 (all the combinations of 2 occupied calls in the 8 total calls), and multiply by the probability of each case in the 8 calls (2 cases occupied and 6 cases not occupied):

P(8,2) = C(8,2) * p(occupied)^2 * p(not_occupied)^6

P(8,2) = (8*7/2) * (0.45)^2 * (0.55)^6

P(8,2) = 28 * 0.2025 * 0.02768 = 0.1569 = 15.69%

7 0
3 years ago
X^{4} - 5x^(2) + 2x + 3 < 0
vlada-n [284]

the Answer is irrational number

7 0
3 years ago
Please answer this friends I am stuck ?
goblinko [34]

Answer:

<u>10°C average temperature</u>

Step-by-step explanation:

Average Temperature = Lowest + 17

= -7 + 17

= 17 - 7

= <u>10°C average temperature</u>

4 0
3 years ago
*High School problem not Middle School
devlian [24]
Should be c ? can you send me a picture please ? and it’s dice .
4 0
4 years ago
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