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Masja [62]
3 years ago
11

How do you solve a 3x3 system of equations.

Mathematics
1 answer:
Kazeer [188]3 years ago
7 0

Answer: well it depends on what comes first but 9

Step-by-step explanation:

You might be interested in
The sum twice a number and 7, OMG I NEED HELP WITH THIS QUESTION SO I won't FAIL the test grades are due tomorrow
ZanzabumX [31]

The value of the sum of twice a number and 7 is 17.

<h3>What is an expression?</h3>

An expression is used to show the relationship between the variables that are given.

Let the number in this situation be 5. This will be illustrated as:

2n + 7

where n = number = 5

= 2n + 7

= 2(5) + 7

= 10 + 7

= 17

Therefore, the number is 17.

Learn more about numbers on:

brainly.com/question/24644930

#SPJ1

6 0
1 year ago
Donna bought 3 pairs of pants for $28.50 each. She also bought a necklace for $12.25. She received a discount of 35% off her ent
oee [108]

Answer:

<em>Donna will have to pay $67.985125 at the register, including the 7% sales tax.</em>

Step-by-step explanation:

Donna bought 3 pairs of pants for $28.50 each.

So, the cost for 3 pair of pants =(28.50\times 3)dollars= 85.50 dollars.

She also bought a necklace for $12.25

Thus, the cost for her entire purchase will be:  (85.50+12.25) dollars = 97.75 dollars.

She received a discount of 35% off her entire purchase. So, the amount of discount =(97.75\times 0.35)= 34.2125 dollars.

Thus, the total selling price will be:  (97.75-34.2125)= 63.5375 dollars.

Percentage of sales tax is 7%. So, the amount of sales tax =(63.5375\times 0.07)= 4.447625 dollars.

Thus, the total amount Donna have to pay at the register =(63.5375+4.447625)=67.985125 dollars.

5 0
3 years ago
What is the explicit rule for the arithmetic sequence shown in the graph?​
Afina-wow [57]

Answer:

Step-by-step explanation:

Looking at the given graph, the slope of the line is expressed as

Slope = (y2 - y1)/(x2 - x1)

y2 = 19.5

y1 = 9.5

x2 = 6

x1 = 1

Slope = (19.5 - 9.5)/(6-1)

Slope = 10/5 = 2

The successive terms is increasing by 2

The formula for the nth term of an arithmetic sequence is expressed as

Tn = a + (n - 1)d

Where

a is the first term of the sequence

n is the number of terms in the sequence.

d is the common difference.

From the information given,

a = 9.5

Tn = an

d = 2

The explicit rule for the arithmetic sequence will be

an = 9.5 + 2(n-1)

8 0
2 years ago
Solve this system of equations. y = 5x +20 and y = -2x -8
Thepotemich [5.8K]

Answer:

y = 0

x = -4

( x, y ) = ( -4 , 0 )

Step-by-step explanation:

y = 5x + 20

y = -2x - 8

Substitute

5x + 20 = -2x - 8

Add 8 on both sides

5x + 20 + 8 = -2x - 8 + 8

5x + 28 = -2x

Subtract 5x on both sides

5x - 5x + 28 = -2x - 5x

28 = -7x

Divide by -7 on both sides

28/-7 = -7x/-7

-4 = x

Now that you have x, you can substitute it in one of the equations that was given to find the value of y.

y = 5x + 20

y = 5(-4) + 20

y = -20 + 20

y = 0

Or....

y = -2x - 8

y = -2(-4) - 8

y = 8 - 8

y = 0

They will both be 0 no matter what

Point form = ( -4, 0 )

Hope this helped

3 0
3 years ago
Quadrilateral ABCD ABCD is similar to quadrilateral EFGH EFGH. The lengths of the three longest sides in quadrilateral ABCD ABCD
Kay [80]
Sketch the two quadrilaterals and label them as shown in the figure below.

Let x =  length of the 4th side of ABCD.

Because ABCD ~ EFGH, therefore
x/5 = 14/6

That is,
x = (5/6)*14 = 11.67 ft

Answer: D. 11.7 ft

5 0
3 years ago
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