Because my mind is gone blank!.... If x = 1 how do I find what y equals? I can't find it anywhere in my book!
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I assume that we are talking about 2 dimensional Cartesian plane with x and y axes. Now get a paper, draw the axes. And start plotting every point that has $\displaystyle x=1$. What does it look like?
Thank you so much! I think I get it now!
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