A facility manager is using mathematical models to track operational costs. Match each equation to the description that correctly identifies its graphical representation and behavior.

A logistics analyst is reviewing two different freight cost models for a regional shipping route.

Model 1 is given by the equation $y = 4x$, where $y$ represents the total cost and $x$ represents the weight of the shipment in tons.

Model 2 is given by the equation $y = 4$.

When these models are plotted on a coordinate plane, which statement correctly describes the graph of Model 2?

Analysis of Fixed and Variable Maintenance Costs

Visual Comparison of Fixed and Variable Billing Models

An operations coordinator is comparing two service leasing options. Option A is represented by the equation $y = 4x$, where $y$ is the total cost and $x$ is the hours of active use. Option B is represented by the equation $y = 4$, which has a flat rate regardless of hours used. When plotted on a coordinate plane, the graph of the variable-cost equation $y = 4x$ produces a slanted line, whereas the graph of the constant-rate equation $y = 4$ is a straight ____ line.

Comparing Variable and Flat Rental Rate Models