Here, y = x – 1

When x = 2,

y = 2 – 1 = 1

When x = 4,

y = 4 – 1 = 3

When x = 6,

y = 6 – 1 = 5

The points in the graph are given as

A = (1, 0)

B = (2, 1)

C = (4, 3)

D = (6, 5)

The line segments are