You can put this solution on YOUR website! It's a linear equation, meaning it's a straight line, so 2 points is sufficient.
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Pick 2 values for y, and x is alway = 6
eg, (0,6) and (6,6)
Plot the points, draw a line thru them.
You can put this solution on YOUR website! x=6 is a vertical line where x is always 6 and y can be anything.
So go to 6 on the x axis and darken the vertical line x=6.
No need to plot points this time.