Question

If y varies directly with x and y =28 when x = 4 what is y when x = 3 show all your work

Answer 1

Answer: y = 4x

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

=

28

when

x

=

7

y

=

k

x

⇒

k

=

y

x

=

28

7

=

4