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3 years ago

Use an inverse matrix to solve for the system of equations.

Mathematics

1 answer:

IrinaK [193]3 years ago

4 0

Answer:

(-1, 7, 2)

Step-by-step explanation:

we suppose that ax + by + cz = d for the matrix

D = det [ 0 4 7] = 100

-6 0 -2

1 2 8

Dx= det [ 14 4 7] = - 100

10 0 -2

-3 2 8

Dy= det [ 0 14 7] = 700

-6 10 -2

1 -3 8

Dz = det [ 0 4 14] = 200

-6 0 10

1 2 -3

So the solution is:

x = Dx/D = -1, y = Dy/D= 7, z =Dz/D = 2

(-1, 7, 2)

have a good day!

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What is the value of y in the equation 4 + y = −3? 7 1 −1 −7

Natasha_Volkova [10]

Answer:

-7 is your answer

Step-by-step explanation:

Isolate the variable, y. Note the equal sign, what you do to one side, you do to the other.

4 + y = -3

Subtract 4 from both sides

4 (-4) + y = -3 (-4)

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4 years ago

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tino4ka555 [31]

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4 years ago

A company has a policy of retiring company cars; this policy looks at number of miles driven, purpose of trips, style of car and

disa [49]

Answer:

$z =\frac{50-64}{7}= -2$

$z =\frac{43-64}{7}= -3$

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And then the final answer for this case would be:

$2.5 -0.15 = 2.35\%$

Step-by-step explanation:

For this case we have the following parameters from the variable number of motnhs in service for the fleet of cars

$\mu = 64, \sigma =7$

For this case we want to find the percentage of values between :

$P(43< X< 50)$

And we can use the z score formula given by:

$z = \frac{X-\mu}{\sigma}$

In order to calculate how many deviation we are within from the mean. Using this formula for the limits we got:

$z =\frac{50-64}{7}= -2$

$z =\frac{43-64}{7}= -3$

And then the final answer for this case would be:

$2.5 -0.15 = 2.35\%$

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3 years ago

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Answer:

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Step-by-step explanation:

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Step-by-step explanation:

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