Let a, b be fixed real numbers. Where do the lines x = a and y = b intersect?
(a) Only at (b, a).
(b) Only at (a, b).
(c) These lines are parallel, so they don’t intersect.
(d) If a = b, then these are the same line, so they have infinitely many points of intersection.
(e) Since these equations are not of the form y = mx + b, the graphs are not lines.
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