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Naddik [55]
3 years ago
15

Topic: Matrix Row Reduction

Mathematics
1 answer:
Rainbow [258]3 years ago
5 0

Write the system as an augmented matrix:

\left[\begin{array}{cc|c}1&5&22\\4&-7&7\end{array}\right]

Add -4 (row 1) to row 2 :

\left[\begin{array}{cc|c}1&5&22\\0&-27&-81\end{array}\right]

Multiply row 2 by -1/27 :

\left[\begin{array}{cc|c}1&5&22\\0&1&3\end{array}\right]

Add -5 (row 2) to row 1 :

\left[\begin{array}{cc|c}1&0&7\\0&1&3\end{array}\right]

Then <em>x</em> = 7 and <em>y</em> = 3.

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(-2.3) +<br> (-5.9)<br><br><br><br> Can somebody please show me how to do these types of problems?
agasfer [191]

Answer:

Idk

Step-by-step explanation: I think u multiply the -2.3 and -5.9 and get 13.57. Idk about the addition part

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3 years ago
Find each sum or difference. Write in simplest fraction form. Pamela ran 7/10 mile on Tuesday and 3/8 mile on Thursday. How much
Jlenok [28]
She ran 13/40 of a mile more on Tuesday
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2 years ago
Hey again.. Please answer!!
Molodets [167]

Answer:

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Step-by-step explanation:

4 0
2 years ago
Read 2 more answers
Please help Explanation will be appreciated thanks,
Genrish500 [490]

Answer: A; 6.3%

Step-by-step explanation:

Problem 1

For the first problem, we first want to find y so that we can plug it into the expression.

We can use elimination method for the system of equations to solve.

3x+3y=21

3x-y=5

We subtract both equations to eliminate x.

4y=16                                        [divide both sides by 4]

y=4

Now that we know y, we can plug it into the expression.

\frac{4}{2} -3                                         [divide]

2-3                                         [subtract]

-1

We know that the answer is A.

--------------------------------------------------------------------------------------------------------

Problem 2

For the second problem, we need to know how to calculate percent error. The formula for precent error is \frac{|measured-exact|}{exact} *100%. We know that the exact value is 80 because the buyer was supposed to given 80. 75 is the measured value because that was what the buyer was given.

\frac{|75-80|}{80} *100%                               [subtract]

\frac{|-5|}{80} *100%                                   [solve absolue value]

\frac{5}{80} *100%                                     [divide]

0.0625*100%                               [multiply]

6.25

Since the problem said to round to one decimal place, we know that the answer is 6.3%.

4 0
2 years ago
Question 7 of 15 Which is an equation of the line through (0,0) and (5,-2)? O A. y = 3 B. y = ja c. y = - 30 D. y=- Y​
9966 [12]

Answer:

b po sana po maka tulong

Step-by-step explanation:

pa brainliest po

6 0
2 years ago
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