In this case the slope is given as m=1/3, and the y-intercept (y value when x=0) is given as -6. That's from the given (x,y), the coordinates of a point, (0,-6).
y=(1/3)x - 6.

Check some x-values to find corresponding y-values. Since this is a line, two points are enough, then draw the line that touches both. When x=0, y=-6. When x=3, y=-5.

The graph looks like this:

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