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3 years ago

X-4y=-4 5x – 4y= 12

Mathematics

2 answers:

vekshin13 years ago

8 0

Answer: {x,y} = {4,2}

[1] x - 4y = -4

[2] 5x - 4y = 12// Solve equation [1] for the variable x

[1] x = 4y - 4

// Plug this in for variable x in equation [2]

[2] 5•(4y-4) - 4y = 12

[2] 16y = 32

// Solve equation [2] for the variable y

[2] 16y = 32

[2] y = 2

// By now we know this much :

x = 4y-4

y = 2

// Use the y value to solve for x

x = 4(2)-4 = 4

Step-by-step explanation:

lidiya [134]3 years ago

5 0

Answer: x=4 y=2

Step-by-step explanation:

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3 years ago

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kramer

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3 years ago

A population of values has a normal distribution with μ = 158.9 μ = 158.9 and σ = 90.4 σ = 90.4 . You intend to draw a random sa

rosijanka [135]

Answer:

$P_{39}=133.68$

Step-by-step explanation:

We are given the following information in the question:

Mean, μ = 158.9

Standard Deviation, σ = 90.4

We are given that the distribution is a normal distribution.

Formula:

$z_{score} = \displaystyle\frac{x-\mu}{\sigma}$

We have to find the value of x such that the probability is 0.39

$P( X < x) = P( z < \displaystyle\frac{x - 158.9}{90.4})=0.39$

Calculation the value from standard normal z table, we have,

$\displaystyle\frac{x - 158.9}{90.4} = -0.279\\\\x = 133.6784\approx 133.68$

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3 years ago

Is 28/81 less than 7/9.Is 28/81 less than 4/9?

lesantik [10]

28/81 is less than 7/9

28/81 is less than 4/9

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2 years ago

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Marina CMI [18]

Answer:

770 km

Step-by-step explanation:

the ratio of Ann driving to total driving = 3 : 11

$\frac{3}{11}$ × total distance traveled = 210km

total distance traveled = 210 km × $\frac{11}{3}$ = 770 km

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3 years ago