Final answer:
To write the equation based on the given diagram, we can compare it with the equation y = mx + b. The value of x cannot be determined without additional information or equations.
Step-by-step explanation:
Based on the given information, we can write the equation as y = mx + b by comparing it with the equation provided. Here, y represents the angle P, m represents the slope of the graph, x represents the variable x, and b represents a constant. The slope of the graph can be calculated using the formula -AH°/R, where AH° is the angle P and R is a constant value.
To find the value of x, we need more information or additional equations.