Question

]If y varies directly as the square root of x and y=−21 when x=400, find y if x=160000. (Round off your answer to the nearest hundredth.)[/tex]

Answer 1

-420

Explanation:

y =
`√(x)` k

-21 =
`\sqrt400}` k

-21 -= 20K Divide both sides by 20

k = -1.05

y =
`√(x)` k

y =
`√(160000)` (-1.05)

y = 400(-1.05)

y = -420