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4 years ago

Solve each problem by forming a pair of simultaneous equations:

Mathematics

2 answers:

Diano4ka-milaya [45]4 years ago

7 0

Answer:

5.5, 9.5

Step-by-step explanation:

Let x and y be the numbers

x+y = 15

x-y = 4

Add the two equations together to eliminate y

x+y = 15

x-y = 4

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

2x = 19

Divide by 2

2x/2 =19/2

x = 9.5

Now find y

x+y = 15

9.5+y = 15

Subtract 9.5

x = 15-9.5

x =5.5

Komok [63]4 years ago

4 0

Answer:

11/2 and 19/2

Step-by-step explanation:

We have to make a system of equations:

1) X + Y = 15

2) X - Y = 4

Working on the first one:

X = 15 - Y

And now let's plug it in the second one:

(15 - Y) - Y = 4

15 - 2Y = 4

2Y = 11

Y = 11/2

Let's substitute this in one of the two equations:

X + 11/2 = 15

X = 19/2

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Opal wanted to make some necklaces and sell them at a craft store. She made 37 necklaces and each necklace had somewhere between

alexandr402 [8]

<h3>The total number of beads used in making 37 necklaces is between 2,664 beads and 2,849 beads.</h3>

Step-by-step explanation:

Here, as given: The number of necklace made by Opal = 37

The least number of bead used in each necklace = 72

So, if each necklace is made using the least number of beads then,

The total number of beads used in 37 necklace = 37 x ( beads in 1 necklace)

= 37 x 72 = 2,664 beads

So, the least number of total beads used in 37 necklaces = 2,664 beads

The highest number of bead used in each necklace = 77

So, if each necklace is made using the highest number of beads then,

The total number of beads used in 37 necklace = 37 x ( beads in 1 necklace)

= 37 x 77 = 2,849 beads

So, if highest number of total beads used in 37 necklaces = 2,849 beads

Hence, the total number of beads used in making 37 necklaces is between 2,664 beads and 2,849 beads.

5 0

3 years ago

Help plz (problly easy for you)

PolarNik [594]

The second option: 4x² - x + 1

All you have to do is add the like terms:

3x² + x² = 4x²

4x - 5x = -x

-2 + 3 = 1

Combine all the results and you will get your solution!

6 0

4 years ago

Can someone help me please???!!

Vlada [557]

Answer:

Step-by-step explanation:

When you shift down by 5 units, you are basically -5ing to every value in the bottom part of the chart.

For the bottom of the chart, I get:

0,2,8,14

While the top is

1,2,3,4 as nothing changes here.

The only chart like this is A.

4 0

4 years ago

Read 2 more answers

Without graphing the linear functions, find the coordinates of the point of intersection of their graphs: y=3x−11 and y=4

egoroff_w [7]

Answer:

(5, 4)

Step-by-step explanation:

given the 2 equations

y = 3x - 11 → (1)

y = 4 → (2)

Substitute y = 4 into (1)

3x - 11 = 4 ( add 11 to both sides )

3x = 15 ( divide both sides by 3 )

x = 5

solution is (x , y) = (5, 4)

8 0

3 years ago

Which of the following expressions is equivalent to 4,325,000,000

Llana [10]

For this case we must find an expression equivalent to:

$4,325,000,000$

To express in scientific notation we must take into account that the power will be positive, that is, the decimal is run to the right.

We test each option.

Option A:

$4,325 * 10^{-9}$

If we run the decimal 9 spaces to the left we have:

$0.000000004325$

Option B:

We discard it because the exponent is negative.

Option C:

$4,325 * 10 ^ 6$

We run the decimal 6 spaces to the right

$4,325,000$

Option D:

$4,325 * 10 ^ 9$

We run the decimal 9 spaces to the right

$4,325,000,000$

Answer:

Option D

7 0

4 years ago