The equation a. 3x+4y+2=0 is a linear equation. This is because it’s in the standard form of a linear equation, Ax + By + C = 0, where A, B, and C are constants. In this case, A=3, B=4, and C=2. The variables x and y are both to the first power, which is a characteristic of linear equations. Linear equations represent straight lines when graphed.