a) 2y=x or y=x/2

:

*********************

    x      y

*********************

    0      2

    2      1

    4      2

    5      5/2

    6      3

   -4     -2

now plot those points and draw a line thru them



do the same thing for b)

:

for b remember all values of y will always be 4 and x can be any value. Horizontal line parallel to and 4 units above the x axis. 

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