Example 1 - no calculation required
The values can be directly read from the table. The f(x) value for a certain value of x can be read from the corresponding f(x) column. The x value for a certain value of f(x) can be read from the corresponding x column.
Example 2 - no calculation required
It can be observed from the graph that for x = -1, the value of y = 2. Count the number of times the graph intersects the x-axis at y = -2.