Which equation is nonlinear? A) 4x = 12

B) xy=12

D) 3x-6y=12

The required "option B) xy = 12" is correct.

Step-by-step explanation:

Check the options:

A) 4x = 12

Dividing both sides by 4, we get

⇒ x = 3

4x = 12 is a linear equation in one variable x.

B) xy = 12

xy = 12 is a non-linear equation.

D) 3x - 6y = 12

Dividing both sides by 3, we get

⇒ x - 2y = 4

3x - 6y = 12 is a linear equation in two variables x and y.

Thus, the required "option B) xy = 12" is correct.