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2 years ago

I need help fr!! ignore the writing lol

Mathematics

2 answers:

Romashka [77]2 years ago

8 0

Answer:

-40

Step-by-step explanation:

(-7)(5)-5=-35-5=-40

sweet-ann [11.9K]2 years ago

8 0

Answer:

-40

Step-by-step explanation:

Inputs are the x values and outputs are the y values. To find the output of a function, substitute the chosen value for x.

For instance, when the input is 5:

$-7(5)-5\\-35-5\\-40$

Then, the output is -40.

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Which explains whether or not the function represents a direct variation?

s2008m [1.1K]

Answer:

The function represents a direct variation

Step-by-step explanation:

we know that

A relationship between two variables, x, and y, represent a direct variation if it can be expressed in the form $y/x=k$ or $y=kx$

In a linear direct variation the line passes through the origin and the constant of proportionality k is equal to the slope m

Let

$A(0,0)$ ------> the line passes through the origin

$B(2,10)$

Find the value of k------> substitute the value of x and y

$y/x=k$ -----> $k=10/2=5$

$C(4,20)$

Find the value of k------> substitute the value of x and y

$y/x=k$ -----> $k=20/4=5$

$D(6,30)$

Find the value of k------> substitute the value of x and y

$y/x=k$ -----> $k=30/6=5$

$E(8,40)$

Find the value of k------> substitute the value of x and y

$y/x=k$ -----> $k=40/8=5$

The value of k is equal in all the points of the table and the line passes through the origin

therefore

The function represents a direct variation

the equation of the direct variation is equal to

$f(x)=5x$

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