Hello!
The given function is a line, to graph it, we need to find the axis intercepts using all the information we have.
So,

Where:

Since it's a possitive slope, the function is increasing.
We cand fint the x-intercept by making the function tend to zero (0), so:



We can find the y-intercept by making the variable tend to zero (0), so:


Therefore, the intercept points will be (-3,0) and (0,6)
For the graph, see the attached image.
Have a nice day!