Question

Assume that y varies inversely with x and that y is 2 when x is 4. Which of the following is the equation of inverse variation?
A) y = 2x
B) xy = 8
C) y/x = 2

Fill in the blank. If xy = 20, then y decreases as x _________.
A) decreases
B) increases
C) stays constant

Which equation is the inverse variation relationship for the following quantities? y =-12 when x = 5
A) y/x = -2.4
B) y = -2.4x
C) xy = -60

Assume that y varies inversely with x. If y = -3 when x = 2.4, what is y when x = 2?
A) -3.6
B) -0.8
C) -7.2
D) 4.8
These are the questions i dont get on my practice exam....anyone help???

Answer 1

the answer have to select from the list?

Answer 2

\[\frac{2}{y}=\frac{x}{4}\]
cross and mutiply
xy=8
is B)

Answer 3

thnx

Answer 4

sencond:
xy=20
y =20-x
answer is :
A)

Answer 5

third:\[\frac{-12}{y}=\frac{x}{5}\]
cross mutipfly
xy= -60
is: C)

Answer 6

You dont have to do all of theem

Answer 7

last one\[\frac{-3}{y}=\frac{2}{2.4}\]
cross time
\[y=\frac{-3\times2.4}{2}=-3.6\]

Answer 8

thank ,but late

Answer 9

Thank You soo muchh!!!!!!