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3 years ago

Which of the following is a solution to the equation "y=3x-1"

Mathematics

2 answers:

taurus [48]3 years ago

7 0

The answer is B, 3x2=6, 6-1=5, therefore x Is 2 and y is 5

nalin [4]3 years ago

4 0

we have

$y=3x-1$

we know that

If the point is an equation solution, it must satisfy the equation.

case a) $(4,1)$

Substitute the values of x and y in the equation

$1=3*4-1$

$1=12-1$

$1\neq11$ -------> the point is not solution of the equation

case b) $(2,5)$

Substitute the values of x and y in the equation

$5=3*2-1$

$5=6-1$

$5=5$ -------> the point is solution of the equation

case c) $(4,3)$

Substitute the values of x and y in the equation

$3=3*4-1$

$3=12-1$

$3\neq11$ -------> the point is not solution of the equation

case d) $(0,-3)$

Substitute the values of x and y in the equation

$-3=3*0-1$

$-3\neq-1$ -------> the point is not solution of the equation

therefore

the answer is

The point $(2,5)$ is solution of the equation

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Answer:

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Step-by-step explanation:

1) Previous concepts

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

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2) Calculate the z score

Let X the random variable that represent the number of text messages per month, and for this case we know the distribution for X is given by:

$X \sim N(3400,450)$

Where $\mu=3400$ and $\sigma=450$

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$z=\frac{4415-3400}{450}=2.26$

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