Final answer:
Without additional context, it's impossible to identify the correct line of reflection. The law of reflection states that the angle of incidence is equal to the angle of reflection (θi = θr). The given equations are all linear as they fit the form y = mx + b.
Step-by-step explanation:
The question asks to identify the equation representing the line of reflection given a set of linear equations: x=6, y=6, y=x, and y=2. To determine the line of reflection, one would generally need more context, such as points or figures and their reflected counterparts. However, with the details provided, it's impossible to definitively state the equation for the line of reflection. In general terms, the line of reflection is equidistant from the pre-image and its image after reflection.
Regarding the law of reflection provided (dr = ₁), this seems to be partially incorrect or incomplete. Typically, the law of reflection states that the angle of incidence is equal to the angle of reflection. In mathematical notation, this is often written as θi = θr, where θi is the angle of incidence and θr is the angle of reflection.
With respect to determining which equations are linear, all the given equations (y = -3x, y = 0.2 + 0.74x, y = -9.4 - 2x) are indeed linear because they can be written in the form y = mx + b, where m represents the slope and b represents the y-intercept of the line.