3 years ago

If y varies inversely as x, when y=20 and x=2 find the equation for y. then, find y when x=4

Mathematics

1 answer:

Tema [17]3 years ago

3 0

Answer:

the equation for y=20=1/2

Step-by-step explanation:

y=1/4

y=0.25

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The answer is: [A]: " $\frac{5}{21}$ " .
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Given:

2/ (7x) = 6/5;

→ (6/5) * (7x) = 2 ;

42x / 5 = 2 ;

42x = 2*5 ;

42x = 10 ;

42x /42 = 10/42 ;

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x = $\frac{5}{21}$ ;

→ which is: Answer choice: [A]: " $\frac{5}{21}$ " .
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