Question

Which equation does not represent a proportional relationship?

Answer 1

The equation
`y=5x-7` doesn't represent a proportional relationship.

Explanation:

• Proportional equations are those linear equations(
  `y=kx+b`) where the value of b≠0, i.e. the line passes through origin.

• 
  `y=5x-7` shows a equation that potrays linear relationship between the variables x and y. This type of equation is an example of non-proportional relationship.

• The remaining three equations are in the form of
  `y=kx` where k is the constant of proportionality. This type of equations represent proportional relationship.