Which of the following is/are linear equations?
2xy + xyz
An equation in which the highest power of the variable is '1' is called a linear equation. 2y+3 is not an equation as it does not have an equality sign in it. The highest power of y in 2y2+3 is '2', so it is not a linear equation. The highest power of y in 2y+3=0 is '1', hence it is a linear equation.