See description in the pic.
When x=0, y=-8, so that is the y-intercept.
When x increases by 1, y decreases by 2, so the slope is -2.
The equation of the function is
.. y = -2x -8
3.21 it should be at least
6.75 is the answer to your question
It will move it from one section to another and make the x axis 4 units more to the right