Question

Y varies directly as x and y=0.5 when x=2. What is y when x=10?

Answer 1

y=0.25x

Explanation:

the initial statement is

y

∝

x

to convert to an equation multiply by k the constant of

variation

⇒

y

=

k

x

to find k use the given condition

y

=

0.5

when

x

=

2

y

=

k

x

⇒

k

=

y

x

=

0.5

2

=

0.25

Answer 2

y=2.5

Explanation:

Proportion

(2/.5)=(10/y)