I am asked to graph this equation by plotting points;

So far I have used these numbers to get the value of

x=0 y=4

x=1 y=5

x=2 y=8

But the problem I am having is that if I keep on, the value for gets further away from the first two points.

If I use a negative number it obviously becomes a positive number....

Could I multiply the entire equation by so that the becomes a negative?

Many thanks in advance

BTW, how do I create a space between the numbers so that when I post it doesn't look too awkward, or confusing??!??