Question

If the value of y value directly with x, which function represents the relationship between x and y when x=3 and y=21?

Answer 1

Answer:

y

=

2

9

x

Explanation:

If  

y

varies directly with  

x

then

XXX

y

=

k

⋅

x

for some constant  

k

Given  

x

=

30

→

y

=

20

3

implies

XXX

20

3

=

k

⋅

30

XXX

→

k

=

20

3

30

=

20

90

=

2

9

Step-by-step explanation: