To get the y-intercept of the function, let us attempt to write out the function in the slope-intercept form.
The slope-intercept form of a linear equation is given to be:

where m is the slope and b is the y-intercept.
To calculate the slope, let us make use of the formula:

We can pick any 2 ordered points from the table, such that:

Therefore, we can calculate the slope to be:

Hence, the equation of the line will look like this:

We can get the value of b by substituting the ordered pair (1, 6) into the equation:

ANSWER
The equation of the line is gotten to be:

Hence, the y-intercept is 9.
The correct option is OPTION B.