HSC Standard Math Practice Exam

In a direct linear variation, the relationship between the variables y and x can be described as y varying directly with x. This means that as the value of x increases, the value of y increases proportionally, and vice versa. Mathematically, this relationship can be expressed as y = kx, where k is a constant known as the constant of variation. This indicates that for any increase in x, there is a corresponding increase in y by the same proportion defined by k.

By recognizing that y varies directly as x, it becomes clear that there is a linear connection between these two variables—indicating that they change together in a predictable manner. This understanding forms the foundation of how variables interact in linear equations and is essential in solving problems that involve direct variation.