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Hi Isabelle, I drew a diagram and identified a few more points on the line. Every point on the line has its x-coordinate equal to 10. Also every point in the plane with x-coordinate equal to 10 is on the line. Thus the points on the line are completely described by the statement "the x-coordinate is equal to 10". Said as an equation this is \[x = 10.\] Penny | ||||||||||||
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