All categories

3 years ago

Help me i need this for khan academy

Mathematics

1 answer:

Airida [17]3 years ago

8 0

Answer:

y = (9/2)x

Step-by-step explanation:

Since the relation is proportional, the equation is ...

y = kx

For any (x, y) pair, you can find k as ...

y/x = k

Using the first pair, we get ...

k = 9/2

so the equation is ...

y = (9/2)x

In decimal, that's ...

y = 4.5x

You might be interested in

BEST ANSWER GETS BRAINLIEST!!!

yKpoI14uk [10]

Answer:

option 4

Step-by-step explanation:

$5x + 2y = 2\\2y = -5x + 2\\y = -\frac{5}{2}x + 1\\\\Slope = -\frac{5}{2}, \ y - intercept = 1$

$3x - 3y = 18\\3y = 3x - 18\\y = x - 6\\\\Slope = 1, \ y - intercept = -6$

5 0

3 years ago

3. 3(a + 1) - 5 = 3a - 2<br>a=

Vera_Pavlovna [14]

Answer:

Step-by-step explanation:

6 0

4 years ago

Read 2 more answers

HELP PLEASE 30 POINTS! WILL MARK BRAINLIEST IF CORRECT!!!!!

KATRIN_1 [288]

Answer:

See Below.

Step-by-step explanation:

We want to verify:

$\cos(x-y)-\cos(x+y)=2\sin(x)\sin(y)$

We will utilize the following identities:

$\cos(x-y)=\cos(x)\cos(y)+\sin(x)\sin(y)$

And:

$\cos(x+y)=\cos(x)\cos(y)-\sin(x)\sin(y)$

So, by substitution, we acquire:

$(\cos(x)\cos(y)+\sin(x)\sin(y))-(\cos(x)\cos(y)-\sin(x)\sin(y))=2\sin(x)\sin(y)$

Distribute:

$\cos(x)\cos(y)+\sin(x)\sin(y)-\cos(x)\cos(y)+\sin(x)\sin(y)=2\sin(x)\sin(y)$

The first and third term will cancel:

$\sin(x)\sin(y)+\sin(x)\sin(y)=2\sin(x)\sin(y)$

Combine like terms:

$2\sin(x)\sin(y)\stackrel{\checkmark}{=}2\sin(x)\sin(y)$

5 0

3 years ago

Read 2 more answers

Choose the correct simplification of the expression (3x)4.

Sonbull [250]

Answer:

81x4

~Hope this answers your question!~

3 0

3 years ago

Read 2 more answers

On Tuesday kali by five CDs on Wednesday Half of all the CDs that she had were destroyed on Thursday there were 22 left how many

pshichka [43]

Answer:

Work:

(x+5)/2=22

We will reverse this equation.

We will start by moving the 2 through inverse operations.

22x2=44

Now we have the equation

x+5=44

We will subtract 5

44-5=39

x=39

the unknown variable equals 39

Kali had 39 CDs on Monday

4 0

4 years ago