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4 years ago

Tell whether x and y show direct variation y=3x

Mathematics

1 answer:

bija089 [108]4 years ago

4 0

Answer:

Yes, they do

Step-by-step explanation:

Yes, y = 3x represents direct variation. The fact that the line (graph) of y = 3x goes through the origin (0,0) reinforces this statement.

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Is -9 a solution of -9f=90-f

Fantom [35]

Answer:

f = -11.25

Step-by-step explanation:

-9f = 90 - f

-8f = 90

f = 90 / -8

f = -11.25

6 0

4 years ago

The number math problems Michel can solve varies directly with the amount of time he spends solving math problems. Michel can so

Mama L [17]

Answer:

40 problems

Step-by-step explanation:

8 problems : 5 mins

? : 25 mins

8 x 5 = 40

40 problems

hope this helps

braonliest plz?

5 0

3 years ago

Read 2 more answers

URGENT PLEASE HELP Definitely need the correct answers as I am failing precalculus

dangina [55]

Answer (first one):

${x|-2\leq x\leq 8}$

Step-by-step explanation:

think of f(x) as y.

$y>-2$

Now find the parts on the x axis that correspond with parts on the y value that are greater than -2.

$x\geq -2 \\x \leq 8$

This would be all of the numbers between -2 and 8 (inclusive).

The reason it is inclusive is because the arrow ends are shaded in.

6 0

3 years ago

Which table shows a function that is decreasing over the interval (−2, 0)?

zhenek [66]

Answer : Image 3

Which table shows a function that is decreasing over the interval (−2, 0)?

We look at the interval -2 to 0 on x

In option 1 table , f(x) is 0 then -5 and then becomes 0

It means -2 to -1 , f(x) decreases but from -1 to 0 y values increases

In option 2 table , f(x) is increasing from -15 to -5

In option 3 table, f(x) values goes on decreasing over the interval -2 to 0

So , option 3 table shows a function that is decreasing over the interval (−2, 0)

8 0

3 years ago

Read 2 more answers

Which is the equation of the line that passes through the points (4,3) and (6,2)?

NeX [460]

Answer:

$\large \boxed{y = - 0.5x + 5}$

Step-by-step explanation:

Goal

Find the equation of the line.

Given

Coordinate points which are (4,3) and (6,2).

Step 1

Find the slope by using slope formula or rise over run.

$\large{m = \frac{y_2-y_1}{x_2-x_1} }$

Substitute the coordinate points in

$m = \frac{3 - 2}{4 - 6} \\ m = \frac{1}{ - 2} \\ m = - \frac{1}{2} \longrightarrow - 0.5 \\ m = - 0.5$

Step 2

Rewrite the equation in slope-intercept form by substituting m = -0.5

$\large{y = mx + b}$

Substitute m = -0.5

$y = - 0.5x + b$

Step 3

Find the value of b by substituting any given coordinate points in the equation.

Substituting both coordinate points still give the same answer.

Step 3.1

Substitute (4,3) in the equation.

$y = - 0.5x + b \\ 3 = - 0.5(4) + b \\ 3 = - 2.0 + b \\ 3 = - 2 + b \\ 3 + 2 = b \\ 5 = b$

Step 3.2

Substitute (6,2) in the equation.

$y = - 0.5 x+ b \\ 2 = - 0.5(6) + b \\ 2 = - 3.0 + b \\ 2 = - 3 + b \\ 2 + 3 = b \\ 5 = b$

Step 4

Rewrite the equation again by substituting the value of b.

$y = - 0.5x + b$

Substitute b = 5 in the equation.

$y = - 0.5x + 5$

Hence, the equation is y = -0.5x + 5

3 0

3 years ago