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3 years ago

7(х - Зу) = y + бу Do it fast thanks

Mathematics

2 answers:

olasank [31]3 years ago

7 0

Answer:

x=4y

7(x−3y)=y+6y

Step 1: Add 21y to both sides.

7x−21y+21y=7y+21y

7x=28y

Step 2: Divide both sides by 7.

7x / 7 = 28y / 7

( the / is an fraction)

spayn [35]3 years ago

5 0

Answer:

x = 4y

Step-by-step explanation:

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Direct variation worksheet

vaieri [72.5K]

Answer:

Part 4) k=1/2

Part 5) k=-2/3

Part 6) y=32

Part 7) x=6

Part 8) v=99

Part 9)b=6

Part 10) y=6

Step-by-step explanation:

we know that

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

In a proportional relationship the constant of proportionality k is equal to the slope m of the line and the line passes through the origin

Part 4) Find the value of the constant of proportionality k

we have

$y=\frac{1}{2}x$

Remember that the value of k is the same that the value of the slope

$m=\frac{1}{2}$

$k=\frac{1}{2}$

Part 5) Find the value of the constant of proportionality k

we have

$y=-\frac{2}{3}x$

Remember that the value of k is the same that the value of the slope

$m=-\frac{2}{3}$

$k=-\frac{2}{3}$

Part 6) Suppose that y varies directly with x, and y=16 when x=8. Find y when x=16

step 1

Find the value of the constant of proportionality k

$k=y/x$

$k=16/8=2$

step 2

Find the equation of the direct variation

$y=kx$

substitute the value of k

$y=2x$

step 3

Find y when x=16

$y=2(16)=32$

Part 7) Suppose that y varies directly with x, and y=21 when x=3. Find x when y=42

step 1

Find the value of the constant of proportionality k

$k=y/x$

$k=21/3=7$

step 2

Find the equation of the direct variation

$y=kx$

substitute the value of k

$y=7x$

step 3

Find x when y=42

$42=7x$

solve for x

$x=42/7$

$x=6$

Part 8) Suppose that v varies directly with g, and v=36 when g=4. Find v when g=11

step 1

Find the value of the constant of proportionality k

$k=v/g$

$k=36/4=9$

step 2

Find the equation of the direct variation

$v=kg$

substitute the value of k

$v=9g$

step 3

Find v when g=11

$v=9(11)=99$

Part 9) Suppose that a varies directly with a, and a=7 when b=2. Find b when a=21

step 1

Find the value of the constant of proportionality k

$k=a/b$

$k=7/2=3.5$

step 2

Find the equation of the direct variation

$a=kb$

substitute the value of k

$a=3.5b$

step 3

Find b when a=21

$21=3.5b$

solve for b

$b=21/3.5$

$b=6$

Part 10) Suppose that y varies directly with x, and y=9 when x=3/2. Find y when x=1

step 1

Find the value of the constant of proportionality k

$k=y/x$

$k=9/(3/2)=6$

step 2

Find the equation of the direct variation

$y=kx$

substitute the value of k

$y=6x$

step 3

Find y when x=1

$y=6(1)=6$

6 0

4 years ago

A stock has a return of -$1.26 per day. Write and solve an equation to find the number n of days until the total return is -$10.

Sedbober [7]

Answer:

Its below

Step-by-step explanation:

The equation is 10.08 / 1.26

n = 8 days

8 0

3 years ago

Pls help n hurry i will give brainliest

AlekseyPX

Answer: A) and B)

Step-by-step explanation:

So for the first one, a closed circle means that it includes the point and the graph proceeds in the positive direction. So it will be whatever number it starts on in the x axis is less than or equal to x.

The second one you find the distance it moves each second.

You do this by distance over time d/t. Then you divide the 408 by that number.

So 264cm / 11 seconds = 24 cm/sec

Then 408cm/ 24cm per sec = 17s

8 0

4 years ago

Brian just started using a budget. He proudly tells friends that his budget helps him know where his money is being spent. It al

belka [17]

<span>Answer: Brian has some understanding of budgeting. However, a budget does not create more money each month. It just helps him use his money better.

This is what Brian said and my assessment:

</span>
<span>.... his budget helps him know where his money is being spent TRUE

It allows him to spend some money on entertainment with the peace of mind that he will be able to pay the rent: TRUE

...and even gives him more money each month NOT REALLY ... money is not created by the budget</span>

3 0

3 years ago

HELP PLEASE I REALLY NEED IT

dangina [55]

Answer:

1.5

Step-by-step explanation:

5 0

3 years ago