Final answer:
The linear equations in the given options are y = -3x and y = 0.2 + 0.74x, making the correct answer choice D.
Step-by-step explanation:
A linear equation is an equation that forms a straight line when graphed. In order for an equation to be linear, the variables must have a degree of 1 and there can be no exponents or other operations involved. Option A, y = -3x, and Option B, y = 0.2 + 0.74x, both have variables with a degree of 1 and no other operations involved, making them linear equations. Option C, y = -9.4 - 2x, also satisfies this criteria and is therefore linear as well. Thus, the correct answer is D. A and B.