Question

1) In 5x - y = 10: the value of C =

A) 5

B) 6

C) -10

D) 10
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Answer 1

If 5xy=10 , what is the value of 8yx ?

First solve for x or y in the original equation:

5x/y = 10

multiply both sides by y:

5x = 10y

Divide by 5:

x = 2y

Substitute for x in the second equation:

8y/x

8y/2y

4y

Conversely, solve for y:

First get y out of the denominator in the first equation by multiplying both sides by y:

5x = 10y

Divide both sides by 10:

5x/10 = y

1x/2 = y; or 0.5x = y

Substitute for y in the second equation:

8y/x

8*(0.5x)/x

4x/x

4

Answer 2

value of C is –10

Step-by-step explanation:

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