FTCE General Knowledge Math Practice Test 2025 – Complete Exam Prep

The correct answer is linear relationship. When two quantities are proportional, it means that as one quantity increases or decreases, the other quantity changes at a constant rate. This relationship can be represented graphically as a straight line passing through the origin, indicating that there is a direct proportionality between the two quantities.

In a linear relationship, you can express one quantity as a constant multiple of the other, which is the hallmark of proportional relationships. For example, if you have a proportional relationship between \( x \) and \( y \), it can be described by the equation \( y = kx \), where \( k \) is a constant.

The other types of relationships listed—binary, quadratic, and exponential—do not represent proportionality in the same way. A binary relationship refers to any interaction between two entities, while quadratic relationships involve variables raised to the second power, resulting in a parabolic graph. Exponential relationships exhibit rapid changes and are characterized by a constant multiplicative effect rather than a constant additive effect.