To solve this question, since we are not given values to plug into the equation. We would assume same values for both equations.
Given equations:
y = -x
x-y = 6 (By making y the subject of formula)
y = x - 6
The vaues we would plug in: x = -1, 0, 1, 2
For first equation: y = -x
when x = -1, y = 1
when x = 0, y = 0
when x = 1, y = -1
when x = 2, y = -2
For second equation: y = x-6
when x = -1, y = -1-6 = -7
when x = 0, y = 0-6 = -6
when x = 1, y = 1-6 = -5
when x = 2, y = 2-6 = -4
Now we plot the values on a graph:
you can make the 1unit or 2unit. I used two units in my graph for y axis and 1 unit for x axis.
The second picture is clearer.