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sashaice [31]
3 years ago
15

Solve the equation 3/y = 4/5

Mathematics
2 answers:
Alexeev081 [22]3 years ago
8 0

Answer:

15/4

Step-by-step explanation:

3/y=4/5

3=4/5(y)

3(5)=4y

15=4y

15/4=y

netineya [11]3 years ago
4 0

Step-by-step explanation:

<u>Step 1:  Cross Multiply</u>

\frac{3}{y} = \frac{4}{5}

5(3) = 4(y)

15 = 4y

<u>Step 2:  Divide both sides by 4</u>

15 / 4 = 4y / 4

3.75 = y

Answer:  y = 3.75

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Solve the following equation simultaneously 1/x-5/y=7, 2/x+1/y=3​
maria [59]

Answer:

  (x, y) = (1/2, -1)

Step-by-step explanation:

Subtracting twice the first equation from the second gives ...

  (2/x +1/y) -2(1/x -5/y) = (3) -2(7)

  11/y = -11 . . . . simplify

  y = -1 . . . . . . . multiply by y/-11

Using the second equation, we can find x:

  2/x +1/-1 = 3

  2/x = 4 . . . . . . . add 1

  x = 1/2 . . . . . . . multiply by x/4

The solution is (x, y) = (1/2, -1).

_____

<em>Additional comment</em>

If you clear fractions by multiplying each equation by xy, the problem becomes one of solving simultaneous 2nd-degree equations. It is much easier to consider this a system of linear equations, where the variable is 1/x or 1/y. Solving for the values of those gives you the values of x and y.

A graph of the original equations gives you an extraneous solution of (x, y) = (0, 0) along with the real solution (x, y) = (0.5, -1).

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2 years ago
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zvonat [6]

Answer:

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Step-by-step explanation:

8 0
3 years ago
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The second answer is right
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Explain how you could write 45 3/8 in scientific notation
vlada-n [284]

First you must change 3/8 into a decimal, so the number would be 45.375. To find scientific notation you have to move the decimal between a factor of 1-10. 4.5375 . You moved over the decimal once toward the left. so scientific notation would be 4.5375 X 10^1

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Which figure has both lines of symmetry and symmetry and rotation symmetry?​
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Step-by-step explanation:

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