Question

Which equation represents a proportional situation?

y = – 3x + 4

y = 3x – 12

y = –2x + 23

y = 9x

Answer 1

The correct answer option is y = 9x.

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.

Answer 2

option D is correct.

y=9x represents a proportional situation

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.