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3 years ago

I need help please my home work not to sure how to do it

Mathematics

2 answers:

horrorfan [7]3 years ago

5 0

To solve for all of your problems you could use substitution, elimination, or graphing.
An example of substitution would be like this
X+5Y=8
X-X+5Y=8-X
5Y=8-X
5Y/5=8-X/5
Y=8-X/5
Now since we put our equation to solve for Y we can plug that equation into 2X-5Y=1.
2X-5(8-X/5)=1
2X-40+5X/-25=1
X=3

Artyom0805 [142]3 years ago

4 0

1. x+5y=8
2x- 5y=1 What you do is find the number/variable that are the same( here is is the +5y and -5y. You want them to be opposites(-,+) so that they cancel each other out. if they are not opposites, then multiply one equation by a negative sign to change it. Cross out the 5y's. Now you can combine like terms-x+2x=3x, and 8+1=9, so now your equation will look like this:
3x=9
x=9/3
x=3
now take x=3 and plug it into the first equation to solve for y. x+5y=8, so 3+5y=8
5y=8-3
5y=5
y=5/5
y=1
(3,1) are your answers.
now do the same with the other problems.

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Use the graphing tool to create a histogram of Gretchen’s data. Use eight bins for your histogram.

lozanna [386]

The number of bins in the histogram determines the width of the bins and

the frequency (number of members) in a bin.

Please find attached the graph of the histogram of Gretchen's data created with MS Excel.

<h3 /><h3>Method used to create the histogram of Gretchen's data</h3>

Given:

The table from Gretchen's data is presented as follows;

$\begin{tabular}{|c|c|} \underline{ Member}& \underline{Number of Days}\\x_1&2\\x_2&4\\x_3&7\\x_4&8\\x_5&12\\x_6&15\\x_7&10\\x_8&7\\x_9&9\\x_{10}&6\\x_{11}&13\\x_{12}&3\\x_{13}&8\\x_{14}&10\\x_{15}&10\end{array}\right]$

The required number of bins = 8 bins

The steps to create the histogram using MS Excel;

Enter the 15 dataset for the number of days as presented in the above table in a column on the worksheet.

Select the dataset entered into the cells from above then select the Insert menu.

In the Chart section of the insert menu click on the Histogram icon to view the quick options for histograms type charts.

Select the Histogram option from the drop down menu from the quick options for histograms, to create an histogram chart.

Right-click the histogram created from the previous step, then select Format Chart Area from the pop up menu.

In the Format Chart Area task pane, click on the arrow next to Chart Options, then select Horizontal Axis from the options menu.

Click on the histogram icon under Axis Options, then click on arrow button besides Axis Option sub menu, to display the axis options.

Click on the Number of bins radio button then enter 8, to create an histogram having 8 bins.

The histogram of Gretchen's data having eight bins created with MS Excel is attached.

Learn more about creating a histogram chart here:

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5 0

2 years ago

BRAINLIESTT ASAP! PLEASE HELP ME :)<br> thanks!

Nataly [62]

Answer:

Step-by-step explanation:

5 0

3 years ago

Read 2 more answers

Which system of inequalities does the graph represent? Which test point satisfies both of the inequalities in that system?

AveGali [126]

Answer:

1) The inequality for the given system are

y ≥ 4x - 4

y ≥ x - 1.5

2) The test point (0,0) satisfies both of the inequalities in the system represented by the graph.

Step-by-step explanation:

Given : A graph showing a system of inequalities.

We have to find the system of inequality.

For line 1)

The points that cut the x and y axis are (1,0) and (0,-4)

Thus, we can find the equation of line using two given point.

Since the general equation of line is y = mx + c

Where m is slope and c is y intercept

Slope is find as $m=\frac{y_2-y_1}{x_2-x_1}$

Substitute, we get,

$m=\frac{-4-0}{0-1}=4$

Slope is 4.

Thus, equation becomes y = 4x + c

For c put (0,-4) in the above equation , we have,

-4 = 4(0) + c ⇒ c = -4

Thus, equation becomes y = 4x - 4

For inequality take a test point (0,0) and we check for which inequality it satisfies the graph region

For (0,0)

y = 4x - 4 becomes 0 = - 4 is satisfied when 0 > -4

thus, the inequality becomes y ≥ 4x - 4

Since, the line is a solid so it will take up equality sign too.

For line 2)

The points that cut the x and y axis are (1.5,0) and (0,-1.5)

Thus, we can find the equation of line using two given point.

Since the general equation of line is y = mx + c

Where m is slope and c is y intercept

Slope is find as $m=\frac{y_2-y_1}{x_2-x_1}$

Substitute, we get,

$m=\frac{-1.5-0}{0-1.5}=1$

Slope is 1.

Thus, equation becomes y = x + c

For c put (0,-1.5) in the above equation , we have,

-1.5 = (0) + c ⇒ c = - 1.5

Thus, equation becomes y = x - 1.5

For inequality take a test point (0,0) and we check for which inequality it satisfies the graph region

For (0,0)

y = x - 1.5 becomes 0 = -1.5 is satisfied when 0 > - 1.5

thus, the inequality becomes y ≥ x - 1.5

Since, the line is a solid so it will take up equality sign too.

Thus, the inequality for the given system are

y ≥ 4x - 4

y ≥ x - 1.5

Also, The test point (0,0) satisfies both of the inequalities in the system represented by the graph.

6 0

3 years ago

What is the midpoint

antoniya [11.8K]

<u>Answer:</u>

(0.5, -0.5)

<u>Step-by-step explanation:</u>

We are given a line segment on the graph with two known points (ending points) and we are to find its mid point.

We know the formula for the mid point:

$Midpoint = ( \frac {x_1 + x_2} {2} ,\frac {y_1 + y_2} {2} )$

Substituting the coordinates of the given points in the above formula:

Mid point = $(\frac {5 + (-4) } {2} , \frac { 6 + (-7)} {2} )$ = (0.5, -0.5)

8 0

3 years ago

Read 2 more answers

Ebonie invests in $2500 today in an account earning 7%. How much will she have in 5 years?

nikdorinn [45]

Answer:

Amount she Receive in 5 years = $3506.37

Step-by-step explanation:

Given in question as

Ebonie invests amount in account = P = $2500

The interest rate she will have = 7%

The amount will keep in account for 5 years

Now we apply compound interest (CI ) to determine how much she will receive after 5 years ,

So , for CI

Amount = principal ( 1 + $\frac{Rate}{100}$ ^ T ,where T is Time

So, A = 2500 ( 1 + $\frac{7}{100}$ )^5

Or, A = 2500 (1.40255)

Or, A = $3506.37

Hence Amount she will receive $ 3506.37 Answer

3 0

3 years ago