The absolute value function is always positive. This is because it is a measure of the distance a value is from the origin and distance is always positive.
Thus | - 2 | = | 2 | = 2
Since both - 2 and 2 are 2 units from the origin
Hence y = | - 2 | = 2
y = | - 1 | = 1
y = | 0 | = 0
y = | 1 | = 1
y = | 2 | = 2
