



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


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