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SVETLANKA909090 [29]
2 years ago
7

Which ordered pair (x, y) is a solution to given system of linear equations?

Mathematics
1 answer:
patriot [66]2 years ago
8 0

Answer:

(\frac{1}{6}, \frac{1}{2}) or (0.167,0.5)

Step-by-step explanation:

Given

3x + y =1

15x + y = 3

Required

Determine the solution

We'll solve using elimination method.

Subtract the first equation from the second:

15x + y = 3

3x + y =1

--------

15x - 3x + y - y = 3 - 1

15x - 3x + y - y = 3 - 1

15x - 3x  = 3 - 1

12x  = 2

Make x the subject:

x = \frac{2}{12}

x = \frac{1}{6}

x =0.167

Substitute \frac{1}{6} for x in the first equation

3x + y =1

3(\frac{1}{6}) + y = 1

\frac{1}{2} + y = 1

Make y the subject

y = 1 -\frac{1}{2}

y = \frac{2-1}{2}

y = \frac{1}{2}

y = 0.5

Hence, the solution is:

(\frac{1}{6}, \frac{1}{2}) or (0.167,0.5)

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Perform the indicated operation.(3/a+2) + (4/a-5)
kipiarov [429]

Answer:

\frac{7(a-1)}{(a+2)(a-5)}

Step-by-step explanation:

To solve this operation we need to find the common multiple of both denominators and solve for a.

\frac{3}{a+2} + \frac{4}{a-5} =\frac{3(a-5)+4(a+2)}{(a+2)(a-5)} =\frac{3a-15+4a+8}{(a+2)(a-5)} =\frac{7a-7}{(a+2)(a-5)} =\frac{7(a-1)}{(a+2)(a-5)}

Thus, the solution is 7(a -1) / (a+2)(a-5)

8 0
3 years ago
Statistics show that about 42% of Americans voted in the previous national election. If three Americans are randomly selected, w
MrRa [10]

Answer:

19.51% probability that none of them voted in the last election

Step-by-step explanation:

For each American, there are only two possible outcomes. Either they voted in the previous national election, or they did not. The probability of an American voting in the previous election is independent of other Americans. 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.

42% of Americans voted in the previous national election.

This means that p = 0.42

Three Americans are randomly selected

This means that n = 3

What is the probability that none of them voted in the last election

This is P(X = 0).

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

P(X = 0) = C_{3,0}.(0.42)^{0}.(0.58)^{3} = 0.1951

19.51% probability that none of them voted in the last election

6 0
2 years ago
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icang [17]

Step-by-step explanation:

a little messy but hope it helps :)) !!

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