Set y=0 to find the x intercept. 0 = -3x+1

-1 = -3x

1/3 = x. That's one point (1/3, 0)

Set x = 0 to find the y intercept. y = -3(0) + 1

y=1. (0,1) is the second point.

Draw the line.

y > -3x+1 is everything above the line, not including the line (draw it with a dotted line.)