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3 years ago

Use the linear combination method to solve this system of equations. What is the value of 3x+7y=3 X-7y=1

Mathematics

1 answer:

Allisa [31]3 years ago

4 0

Answer:

look at the picture shown

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How to solve |3+x| -5 = -3

Irina-Kira [14]

To solve for x, you first add 5 to both sides so it remains equal.

3 + x = 2

Then you simply subtract 3 on both sides.

x = -1

Substitute your solution into the equation and see it is true.

|3+(-1)) - 5 = -3

The equation is true, therefore your answer is: x = -1

5 0

2 years ago

Fill in the box to make the equation true. 5x + something - 3x=4x

Sveta_85 [38]

Answer: 2x

Step-by-step explanation: because 5+2-3=4

5 0

3 years ago

Read 2 more answers

Please, I really need math help.

Nostrana [21]

Hello:
the equation is : y = ax+b
the slope is a : a×(-3/2) = -1......( perpendicular to a line with a slope of -3/2)
a = 2/3 y=(2/3)x+b
the line that passes through (-2, -2) :- 2 = (2/3)(-2)+b
b = -2/3
 the equation is : y = (2/3)x-2/3

y =(2/3)(x-1)

4 0

3 years ago

1) The relation R on the set {1,2,3, 4}is defined as

Westkost [7]

Matrix dimension 4x4. We put 1 if role is in relation with the collon (role is first number of (a,b), number a, and collone is number b. We have them 4). So, the matrix representation is:

0 0 1 1

0 1 0 0

0 0 0 0

7 0

2 years ago

4. The results of testing a new drug on 1,000 people with a certain disease found that 510 of them improved when they used the d

Shalnov [3]

Answer:

It would not be reasonable to say that more than half of the people with this disease would improve if they used the new drug

Step-by-step explanation:

Data provided in the question:

Sample size, n = 1000

Number of people improved when they used the drug = 510

Thus,

Probability that Number of people improved when they used the drug

= 510 ÷ 1000

= 0.510

Now,

margin of error, E = $2\times\sqrt{\frac{p(1-p)}{n}}$

= $2\times\sqrt{\frac{0.510(1-0.510)}{1000}}$

= 0.032 = 3.2%

Therefore,

Portion of 0.510 is likely to lie in the 3.2% of the actual value of population

And,

The lower portion can be as small as p - E

= 0.510 - 0.032

= 0.478 i.e 47.8% of the sample

Hence,

It would not be reasonable to say that more than half of the people with this disease would improve if they used the new drug

4 0

3 years ago