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Dear Student,

To draw graph of line y=6-2x, we need to plot the values of x and y on graph
 

x	y
0	6
1	4
2	2
3	0

The graph is 


b)

$$\begin{gathered} The gradiant of line is given by \\ gradient=\frac{change in y coordinate}{change in x coordinate} \\ take any x and y pair from above table \\ gradient=\frac{4-6}{1-0} \\ =-2 \\ or take other value \\ gradient=\frac{2-6}{2-0} \\ =\frac{-4}{2} \\ =-2 \end{gathered}$$

Regards,