All categories

3 years ago

The variables y and x have a proportional relationship, and y = 15 when x = 3. What is the value of x when y = 4?

Mathematics

2 answers:

madam [21]3 years ago

8 0

answer:

y = 19.2 when x = 8

So the answer is 8

MArishka [77]3 years ago

8 0

Answer:

x = 5/4 = 1.25

Step-by-step explanation:

There are 4 types of relationships namely; Direct, inverse, joint and partial. This is a direct proportion.

y = 15 when x = 3

y = kx where k is the constant of proportionality.

15 = k × 3

k = 15/3

k = 5, y = 5x

the value of x when y = 4,

4 = 5x

x = 5/4 = 1.25

You might be interested in

-9 - 3x4 pls show work

alina1380 [7]

Answer:

Step-by-step explanation:

3x4 is 12 and then you subtract them from each 9ther

8 0

3 years ago

Read 2 more answers

How do you solve 3(x-10)= -6 ?

Andrei [34K]

Answer:

x=8

Step-by-step explanation:

3(x-10)=-6

3x-30=-6

3x=24

x=8

6 0

3 years ago

Read 2 more answers

Find expressions for the partial derivatives of the following functions:

nlexa [21]

Answer:

Step-by-step explanation: partial derivative is the differentiation of one variable e.g. X while leaving the values of the other variable e.g. Y

These four questions A, B, C and D have different functions separated by commas. I will not assume the commas to be something else like a plus sign.

A. f(x) = g'(x).k(y) , g'(x) + h(y)

f(y) = k'(y).g(x) , g(x) + h'(y)

B. f(x) = g'x (x+y)

f(y) = g'y (x+y) , h'y (y+z)

f(z) = h'z (y+z)

C. f(x) = f'x (xy) , f'x (zx)

f(y) = f'y (xy) , f'y (yz)

f(z) = f'z (yz) , f'z (zx)

D. f(x) = f'x (x) , g'(x) , h'x (x,y)

f(y) = h'x (x,y)

These are the partial derivative expressions for each variable in each function. You will need to pay a lot of attention to understand:

* while differentiating X alone, functions in Y which are separated by commas from the functions in X, are ignored totally because they are different questions

* In functions where X added to Y is in a bracket e.g. (x+y), to find the derivative of X, Y isn't thrown away because they are joined (by a plus sign) the derivative of X alone in this case would be f'x (x+y)

* f(x), just like g(x), simply means/represents a function in X hence f'(x) means the differentiation of all X-terms in that function

6 0

3 years ago

Geometry question, need some help :)

kodGreya [7K]

Answer:

Links are blurry please type (:

Step-by-step explanation:

8 0

3 years ago

Farmer Jones raises ducks and cows. He looks out his window and sees 54 animals with a total of 122 feet. If each animal is “nor

Olenka [21]