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bogdanovich [222]
4 years ago
10

Which matrix represents the system of equations shown below? 3x -7y=21

Mathematics
1 answer:
Serjik [45]4 years ago
8 0

\left\{\begin{array}{ccc}3x-7y=21\\4x+5y=11\end{array}\right \\\\.\ \ x\qquad y\ \ const.\\\left[\begin{array}{ccc}3&-7\\4&5\end{array}\right|\left\begin{array}{ccc}21\\11\end{array}\right]

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Kate sold 12 of her paintings and purchased 7 more. if kate has 21 paintings now, how many paintings did she have to begin with?
kicyunya [14]
First, let x or any variable represent the number of paintings Kate initially has. After selling 12 of it, her paintings now becomes only x - 12. Then, she purchased 7 more making the number of her paintings become x - 12 + 7 = x - 5. This number tantamount to 21. 

                                           x - 5 = 21      ; x = 26

Thus, Kate initially had 26 paintings. 
7 0
3 years ago
Find the domain of the function.
bonufazy [111]

x + 6 >= 0

x >= -6

Choice B is the answer.

Do you know why?

8 0
3 years ago
Ty guys for helping me i need two more pls
Gnoma [55]

Answer:

Step-by-step explanation:

No help me

6 0
3 years ago
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Please I need help asap
jasenka [17]

Answer:

Option D - x = 3 3/5

Step-by-step explanation:

Lets make the left side into an improper fraction :

2 2/5 = 12/5

Now let's make both fraction into equivalent ones but with the same denominator :

2/3 = 10/15

12/5 = 36/15

Now we substitute the equivalent values back into the equation :

10/15 × x = 36/15

Now we multiply both sides by 15 to remove the denominators:

10 × x = 36

Now we divide both sides by 10 and simplify :

x = 36/10

x = 18/5

x = 3 3/5

So our answer will be Option D  

Hope this helped and brainliest please

7 0
2 years ago
4/x=28/70<br> Pleaseeeee hwlpp
PolarNik [594]

Answer:

x= 10

Step-by-step explanation:

hay esta la respuesta:)

3 0
3 years ago
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