Какое из этих уравнений является линейным

I don't know the specific equations you're referring to, but I can help you understand what a linear equation is. A linear equation is an equation that represents a straight line when graphed. It is in the form y = mx + b, where m is the slope and b is the y-intercept. If any of the given equations can be written in this form, then it is a linear equation.