Mathematics, 10.01.2020 11:31, bri9263

Alength of ribbon is cut into two pieces to use in a craft project. the graph shows the length of the second piece, x, for each length for the first piece, y.

a. how long is the ribbon? explain how you know.

b. what is the slope of the line?

c. explain what the slope of the line represents and why it fits the story.

Answers: 3

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answered: kawtharALSAMARY

We want to answer different things by using the linear relation that relates the length of the two pieces of ribbon.

A) 15 ft

B) -1

C) It means that a unit increase in x causes a unit decrease in y.

A) First we want to see how long is the ribbon.

Notice that:

x = second piece lengthy = first piece length.

You can see that when x = 0ft (so we don't cut anything) we have y = 15ft, thus the length of the ribbon is 15ft (we also can see that when y = 0ft, x is equal to 15ft).

B) We want to get the slope.

Notice that the line passes through the points (0, 15) and (15, 0), so the slope is:

$a = \frac{0 - 15}{15 - 0} = -1$

C) The slope of -1 implies that each unit increase in x causes a unit decrease in y.

This makes sense because if the second ribbon is cut 1 ft longer, this means that the first ribbon becomes 1 ft shorter.

If you want to learn more, you can read:

link

answered: amp92904

Part A) The length of the ribbon is 15 feet

Part B) m=-1

Part C) see the explanation

Step-by-step explanation:

Part A)

Let

x -----> the length of the second piece of ribbon in feet

y -----> the length of the first piece of ribbon in feet

we know that

The length of the ribbon is equal to the sum of the first piece and the second piece of ribbon

y+x

take any point from the graph

Example

(13,2)

That means

Second piece ----> x=13 ft

First piece ----> y=2 ft

The length is (y+x)=2+13=15 ft

Part B) What is the slope of the line?

The formula to calculate the slope between two points is equal to

$m=\frac{y2-y1}{x2-x1}$

take the intercepts from the graph to calculate the slope

we have

(0,15) and (15,0)

substitute

$m=\frac{0-15}{15-0}$

m=-1

Part C) Explain what the slope of the line represents

we know that

The slope is equal to -1

That means, that we have a decreasing function, as the value of x (length of second piece) increases by one, the value of y (length of the first piece) decreases by one

The slope fits in the story because the linear equation in slope intercept form between the variable x and the variable y is equal to

y=-x+15

answered: Guest

both equations and proportions are better.

answered: Guest

linear pair postulates

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Alength of ribbon is cut into two pieces to use in a craft project. the graph shows the length of th...