Match each system of equations to its graph. y = 2x + 1
y = x + 2
y = 3x
y = x + 3
y = 2x − 2
y = x − 2
y = 2x + 3
y = x + 5
y = 4x + 2
y = 3x + 2

An incoming airplane is x miles due north from the control tower at an airport. a second incoming airplane is y miles due east of the same control tower. the shortest distance between the two airplanes is z miles. which of the following functions would best model the situation above?