The supplement of 30° is the angle that when added to 30° forms a straight angle (180° ).
First using the given two points we can find the slope (m) of the line

Thus the slope of given line is 1.
Using slope and a point (0,1) we can write the equation in point slope form as
y - 1= 1(x-0)
y - 1 = x
The above equation is the point-slope form of the equation.
Mean 6.6
Median 6
Mode 3
Range 10
not positive on the 6.6 but the rest should be good