Final answer:
The correct answer is D. A and B.
Step-by-step explanation:
The correct answer is D. A and B.
A linear equation is an equation where the variables are raised to the power of 1, and the equation forms a straight line when graphed. Options A and B are linear equations because the variables x and y are raised to the power of 1. Option C is not a linear equation because the variable x is being raised to the power of 2.
Therefore, options A and B are the only linear equations in the given choices.