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4 years ago

15-5y=20 what is the value of y?

Mathematics

2 answers:

Natasha_Volkova [10]4 years ago

6 0

Answer:

15-5y=20

15-20=5y

-5=5y

y=-1

AnnZ [28]4 years ago

6 0

Answer:

Step-by-step explanation:

$swap \: - 5y \: and \: 15$

working step:

$15+−5y=20 \\ −5y+15=20 \\ −5y+15−15=20−15 \\ −5y=5 \\ −5y−5=5−5 \\ y=−1$

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If f(x)=ax+b/x and f(1)=1 and f(2)=5, what is the value of A and B?

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Answer:

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Step-by-step explanation:

$f(x) = \frac{ax+b}{x}$

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$a+b-(2a+b) = 1-10\\a+b-2a-b = -9\\a-2a = -9\\-a = -9\\a = 9$

For b , Put a = 9 in equation (1)

$9+b = 1\\Subtracting \ both \ sides \ by \ 9\\b = 1-9\\b = -8$

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