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jenyasd209 [6]
3 years ago
13

Find x and y in the system of equations:

Mathematics
2 answers:
NemiM [27]3 years ago
7 0

Answer:

Y= -8

X= 3

Step-by-step explanation:

apply -(-a)=a rule

-23+4*8/3

-23+4*8=9

9/3

=3

2y-(3)=-19

y= -8

dedylja [7]3 years ago
7 0

Answer:

x = 3

y = -8

Step-by-step explanation:

We have two simultaneous equations:

3x + 4y = -23

2y - x = -19

Solve for y in the second equation.

2y = -19 + x

y = -19/2 + 1/2x

Put y as -19/2 + 1/2x in the first equation and solve for x.

3x + 4(-19/2 + 1/2x) = -23

3x + 2x - 38 = -23

5x - 38 = -23

5x = -23 + 38

5x = 15

x = 15/5

x = 3

Put x as 3 in the second equation and solve for y.

2y - 3 = -19

2y = -19 + 3

2y = -16

y = -16/2

y = -8

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When Noah goes bowling, his scores are normally distributed with a mean of 150 and a standard deviation of 12. What is the proba
Zarrin [17]

Answer:

The probability of his score being between 135 and 167 is 0.8151 or (0.8151*100=81.51%)

Step-by-step explanation:

Given that:

Mean = μ = 150

SD = σ = 12

Let x1 be the first data point and x2 the second data point

We have to find the z-scores for both data points

x1 = 135

x2 = 167

So,

z_1 = \frac{x_1-mean}{SD}\\= \frac{135-150}{12}\\=\frac{-15}{12}\\=-1.25

And

z_2 = \frac{x_2-mean}{SD}\\z_2 =\frac{167-150}{12}\\=\frac{17}{12}\\= {1.416}

We have to find area to the left of both points then their difference to find the probability.

So,

Area to the left of z1 = 0.1056

Area to the left of z2 = 0.9207

Probability to score between 135 and 167 = z2-z1 = 0.9027-0.1056 = 0.8151

Hence,

The probability of his score being between 135 and 167 is 0.8151 or (0.8151*100=81.51%)

3 0
3 years ago
How can you tell if a point is a solution to a system of equations?
Anna35 [415]

Answer: you have to substitute them into the equation

Step-by-step explanation:

example: x = 2y - 6

lets say you test 4/5 so it would be 4 = 2(5) - 6

this equals 4 = 10 - 6 which is true

so that is how you test to see if the equation is right

remember the first number goes to "x" and the second one goes to y

hope this helps mark me brainliest if you can

3 0
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Find the range of possible lengths of the third side using the given side lengths <br> 10, 7
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Answer:

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Step-by-step explanation:

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Answer:

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