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3 years ago

7

X+z=6 5y+9z=1 what is a possible way to eliminate the y term

1 answer:

MArishka [77]3 years ago

4 0

Assuming that these two equations aren't being multiplied:

solve the second equation for y

5y+9z=1 5y=1-9z y=(1-9z)/5

substitute y for 0

0=(1-9z)/5

5=1-9z
We could leave it like this, but I'm not going to because it feels so unfinished.
5-1=-9z
4=-9z
-4/9=z

x+z=6

x-(4/9)=6
x=6+(4/9)
x=58/9

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4 years ago

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3 years ago

Read 2 more answers

If a tapestry is 5/8 yards long and 3/10 yards high. What is the area of the tapestry?

Evgesh-ka [11]

<u>Area of Tapestry is 0.1875 yards² .</u>

Step-by-step explanation:

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3 0

3 years ago

A multiple choice test has four possible answers for each question. Let X be the number of correct responses in a test of 100 qu

dimulka [17.4K]

Answer:

a. 4.33.

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If there is only one correct answer out of four alternatives, the expected proportion of correct answers is p =0.25

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The standard deviation of a proportion 'p' is given by:

$s=\sqrt{\frac{p*(1-p)}{n} }$

Applying the given data:

$s=\sqrt{\frac{0.25*(1-0.25)}{100}}\\s=0.0433$

If X is the number of correct responses in 100 guesses, the standard deviation of X is:

$\sigma = n*s=100*0.0433\\\sigma = 4.33$

The standard deviation of X is 4.33 questions.

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3 years ago