Which equation represents a proportional situation?

y = - 3x + 4

y = 3x - 12

y = - 2x + 23

y = 9x

option D is correct.

y=9x represents a proportional situation

Step-by-step explanation:

If two quantities are said to have a proportional relationship if they vary in such a way that one of the quantities is a constant multiple of the other i. e,

y = |k|x; where |k| is constant proportionality.

By definition:

y = 9x where k = 9 is constant, represents a proportional relationship.

The correct answer option is y = 9x.

Step-by-step explanation:

From the given equations as the possible answer options, y = 9x is the correct answer which represents a proportional situation.

Two values (variables in this case) are said to be proportional if they change in a way such that there is a constant multiple multiplied to one of the values.

Here, in the equation y = 9x, y and x are the two variable and 9 is the constant multiple.