This is from my algebra, is x/2 equal to -2x

Mathematics

1 answer:

slega [8]3 years ago

6 0

No, because x/2 divides x by two, while -2x multiplies x by -2.

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7 + 2y = 8x 3x - 2y = 0 Solve the system of equations by substitution. (70/3, 140/9) (7/5, 21/10) no solution coincident

Wittaler [7]

So we have the system of equations:
$7+2y=8x$ equation (1)
$3x-2y=0$ equation (2)

To use substitution, we are going to solve for one variable in one of our equations, and then we are going to replace that value in the other equation:
Solving for $x$ in equation (2):
$3x-2y=0$
$3x=2y$
$x= \frac{2}{3}y$ equation (3)

Replacing equation (3) in equation (1):
$7+2y=8x$
$7+2y=8( \frac{2}{3} y)$
$7+2y= \frac{16}{3} y$
$7= \frac{10}{3} y$
$y= \frac{7}{ \frac{10}{3} }$
$y= \frac{21}{10}$ equation (4)

Replacing equation (4) in equation (3):
$x= \frac{2}{3}y$
$x=( \frac{2}{3} )( \frac{21}{10} )$
$x= \frac{7}{5}$

We can conclude that the solution of our system of equations is <span>(7/5, 21/10)</span>

5 0

2 years ago

8 people are in line a family with a wife and husband and 3 children cut in line then 4 more people cut in line then the family

SVETLANKA909090 [29]

Answer:

17 people

Step-by-step explanation:

8 people are in line a family with a wife and husband and 3 children cut in line then 4 more people cut in line then the family with 3 children cut in line in front again how many people are there?

8 (the begining) + 5 (wife husband & 3 children) + 4 ( the four more people)= 17 (donʻt add the family w/ 3 children again because they were already in line.)

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I need help with a word problem .

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What is the problem ?

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2 years ago

noted psychic was tested for extrasensory perception (ESP). The psychic was presented with 400 cards face down and asked to dete

adelina 88 [10]

Answer:

A sample of 11352 is needed.

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of $\pi$ , and a confidence level of $1-\alpha$ , we have the following confidence interval of proportions.