Question

7
7. If z is directly proportional to x and z = 12 when
x = 3, find the value of x when z = 18.​

Answer 1

Answer: mark me as brainliest PLZ

Step-by-step explanation:

GIVEN :

The variable z is directly proportional to x and z=12 when x=3.

TO FIND :

The value of x when z =18

SOLUTION :

Given that z is directly proportional to x and z=12 when x=3.

Now we have to find the value of x when z=18 :

The variable z is directly proportional to x.

When z is 12 , x has the value 3

A directly proportional variable z to x can be written as,

where k is constant of proportionality.

Now we have,

 (∵  z=12 when x=3)

∴  

Now put z=18 then  

Substitute the value of k in the above equation we get

∴ x=72 when z=18.

∴ the value of x when z=18 is 72.

Answer 2

Answer:

18/4=4.5

Step-by-step explanation: