Please help ASAP! Does this represent a nonlinear function, a linear function, or not a function?

Graph y = -|x| + 2. click on the graph until the correct one appears.

y=2x−1 5x−4y=1 is (1,1)(1,1) a solution of the system?

The price for gasoline is represented by the equation y=3.69x, where y represents the total price for x gallons of gasoline. on a graph, the number of gallons is represented on the horizontal axis, and the total price is represented on the vertical axis. determine whether each statement describes the graph of the equation. select true or false for each statement