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4 years ago

-9.3x+8.6y=45.1 7.1x+1.7y=-17.9 What is x and y?

Mathematics

1 answer:

Veseljchak [2.6K]4 years ago

3 0

Answer:

(x, y) = (-3, 2)

Step-by-step explanation:

For equations that involve tedious math, I like to let a graphing calculator do it. The solution is ...

(x, y) = (-3, 2)

_____

Fully equivalent to solution by elimination is the use of Cramer's rule. It tells you ...

Δ = (-9.3)(1.7) -(7.1)(8.6) = -76.87

x = ((45.1)(1.7) -(-17.9)(8.6)) / Δ = 230.61/-76.87 = -3

y = ((-9.3)(-17.9) -(7.1)(45.1)) / Δ = -153.74/-76.87 = 2

The solution is (x, y) = (-3, 2).

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Each week, Phyllis earns $20 per hour. Which graph expresses the relationship

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Well, the answer to this question is the first option. The reason for this is because we can see that for every hour, Phyllis is earning and getting $20.00 whereas the other graphs are not showing this relationship.

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3 years ago

The distance between Miami and Naples is 107 miles the distance between Miami and Jacksonville is about three times the distance

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No. The biggest estimate you could make would be
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4 years ago

The Census Bureau says that the 10 most common surnames in the United States are, in order, Smith, Johnson, Williams, Brown, Jon

olga_2 [115]

Answer:

0.4460 = 44.60% probability that none of the 8 surnames of these authors were among the 10 most common

Step-by-step explanation:

For each surname, there are only two possible outcomes. Either they are among the 10 most common, or they are not. Each author is independent of each other. So we use the binomial probability distribution to solve this question.

Binomial probability distribution

The binomial probability is the probability of exactly x successes on n repeated trials, and X can only have two outcomes.

$P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}$

In which $C_{n,x}$ is the number of different combinations of x objects from a set of n elements, given by the following formula.

$C_{n,x} = \frac{n!}{x!(n-x)!}$

And p is the probability of X happening.

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$P(X = 0) = C_{8,0}.(0.096)^{0}.(0.904)^{8} = 0.4460$

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3 years ago

I need some help with this question.

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<h3>What is dilation?</h3>

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He draws the triangle ΔPQR to show his original garden.

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He uses vertex P as the center of the dilation.

The ratio of the corresponding sides will be given as

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More about the dilation link is given below.

brainly.com/question/2856466

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2 years ago

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Nesterboy [21]

Answer:

Jack's linear speed is 126ft/min

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Step-by-step explanation:

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5 0

3 years ago