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DENIUS [597]
3 years ago
10

What is the graph of the inequality? 3x ≤ 2y - 7

Mathematics
2 answers:
BlackZzzverrR [31]3 years ago
3 0

Answer:

graph is attached below.

Step-by-step explanation:

Given : equation 3x ≤ 2y - 7

We have to plot the graph for the given inequality.

Consider the given inequality 3x ≤ 2y - 7

To plot the graph we first convert inequality to equality.

then equation becomes, 3x = 2y - 7  

We find the points to plot this line,

at x = 1

⇒ 3(1) = 2y - 7

⇒ 3 = 2y - 7

⇒2y = 10

⇒ y = 5

at x = 3

⇒ 3(3) = 2y - 7

⇒ 9 = 2y - 7

⇒2y = 16

⇒ y = 8

at x = 5

⇒ 3(5) = 2y - 7

⇒ 15 = 2y - 7

⇒2y = 22

⇒ y = 11

Thus,   points are (1 , 5) , (3,8) and (5 , 11)

Now we plot these points and obtained the graph of line 3x = 2y -7

For region to be shaded take a test point and check whether it satisfy the given given inequality or not.  

Let point be (-3, 0)

Substitute x= -3 and y = 0, we get

3(-3) ≤ 2(0) - 7

⇒ -9 ≤  - 7  (true)

Graph plot is as shown below.

Naddika [18.5K]3 years ago
3 0

Answer:

( 0, 3.5)  (3,8) and shaded up.

Step-by-step explanation:

Given : 3x ≤ 2y - 7

To find  : graph.

Solution : We have given that 3x ≤ 2y - 7

On adding both side by 7

3x + 7  ≤ 2y

On dividing by 2 both side

\frac{3x}{2} + \frac{7}{2} \leq y

Here slope  = \frac{3}{2} and y intercept =  \frac{7}{2}

Slope  =  1 .5 and y intercept= 3.5

One point is ( 0, 3.5)

For more point by Rise over Run =  \frac{3}{2}

It mean it take 3 unit up and 2 unit right or 3 unit down and 2 unit left .

For inequality ( greater than equal to sign ) it would be shaded up.

Therefore,  ( 0, 3.5)  (3,8) and shaded up.

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Step-by-step explanation:

6 0
4 years ago
The probability that a grader will make a marking error on any particular question of a multiple-choice exam is 0.15. If there a
sashaice [31]

Answer:

P(X=0)=(10C10)(0.15)^{0} (1-0.15)^{10-0}=0.1969

P(X \geq 1)= 1-P(X

P(X=0)=(nCn)(p)^{0} (1-p)^{n-0}=(1-p)^n

P(X \geq 1)= 1-P(X

Step-by-step explanation:

Previous concepts

A Bernoulli trial is "a random experiment with exactly two possible outcomes, "success" and "failure", in which the probability of success is the same every time the experiment is conducted". And this experiment is a particular case of the binomial experiment.

The binomial distribution is a "DISCRETE probability distribution that summarizes the probability that a value will take one of two independent values under a given set of parameters. The assumptions for the binomial distribution are that there is only one outcome for each trial, each trial has the same probability of success, and each trial is mutually exclusive, or independent of each other".

The probability mass function for the Binomial distribution is given as:  

P(X)=(nCx)(p)^x (1-p)^{n-x}  

Where (nCx) means combinatory and it's given by this formula:  

nCx=\frac{n!}{(n-x)! x!}  

The complement rule is a theorem that provides a connection between the probability of an event and the probability of the complement of the event. Lat A the event of interest and A' the complement. The rule is defined by: P(A)+P(A') =1

Solution to the problem

Let X the random variable of interest, on this case we now that:

X \sim Binom(n=10, p=0.15)

what is the probability that no errors are made?

For this case means that all the questions were correct so we want this probability:

P(X=0)=(10C10)(0.15)^{0} (1-0.15)^{10-0}=0.1969

what is the probability that at least one error made?

For this case we want this probability:

P(X \geq 1)

And we can use the complement rule:

P(X \geq 1)= 1-P(X

If there are n questions and the probability of a marking error is p rather than 0.15, give expressions for the probabilities of no errors  and at least one error

P(X=0)=(nCn)(p)^{0} (1-p)^{n-0}=(1-p)^n

P(X \geq 1)= 1-P(X

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