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2 years ago

-5x+8y=5 need answer

Mathematics

1 answer:

adoni [48]2 years ago

8 0

Answer: $x=\frac{8}{5}y-1$

Step-by-step explanation:

$-5x+8y=5$

$-5x+8y+-8y=5+-8y$

$-5x=-8y+5$

$\frac{-5x}{-5} = \frac{-8y+5}{-5}$

$x=\frac{8}{5} y-1$

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A/ab-bsquare + b/ab-asquare?

lord [1]

Answer:

$\dfrac{(a+b)}{ab}$

Step-by-step explanation:

The given expression is :

$\dfrac{a}{ab-b^2}+\dfrac{b}{ab-a^2}$

It can be solved as follows :

$\dfrac{a}{ab-b^2}+\dfrac{b}{ab-a^2}=\dfrac{a}{b(a-b)}+\dfrac{b}{a(b-a)}\\\\=\dfrac{a}{b(a-b)}+\dfrac{b}{-a(-b+a)}\\\\=\dfrac{1}{a-b}(\dfrac{a}{b}-\dfrac{b}{a})\\\\=\dfrac{a^2-b^2}{ab(a-b)}\\\\=\dfrac{(a-b)(a+b)}{ab(a-b)}\\\\=\dfrac{(a+b)}{ab}$

So, the solution of the given expression is equal to $\dfrac{(a+b)}{ab}$ .

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3 years ago

The scores on a psychology exam were normally distributed with a mean of 60 and a standard deviation of 10 . A failing grade on

tensa zangetsu [6.8K]

Answer:

The cutoff for a failing score was 40,

Approximately 2.3% of the students failed.

Step-by-step explanation:

Given,

Mean, $\mu=60$

Standard deviation, $\sigma=10$

Let x represents the cutoff for a failing score,

Thus, according to the question,

$\frac{x-\mu}{\sigma}=-2$

$\frac{x-60}{10}=-2$

$x-60=-20$

$x=-20+60$

$x=40$

Thus, the cutoff for a failing score is 40,

∵ P(<-2) = 0.02275 = 2.275 % ≈ 2.3 %

Hence, Approximately 2.3 % of the students failed. 

7 0

2 years ago

Evaluate 4/3 <br><br><br> please help!

Mashcka [7]

Answer:

1.33333333333

Step-by-step explanation:

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3 years ago

If y is directly proportional to x and y = -15 when x=3 find the value of y when x is 20?

leonid [27]

Answer: y = 2

Explanation:

When x = 3, y = -15

And x and y are directly proportional.

thus x + k ==> y + k

when x = 3 + 17 ==> y = -15 + 17

=> x = 20 ==> y = 2

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2 years ago

Pls help thannnnkkkss <33

juin [17]

Answer: You would put the parentheses here 24 divided by 6 x 2 - (1 +4)

Have a nice day!

5 0

2 years ago