Expression 1: "y" equals StartRoot, StartFraction, left parenthesis, 398600.4 4 1 8 times 10 to the 9th power , right parenthesis Over left parenthesis, "x" plus 6378 , right parenthesis times 10 cubed , EndFraction , EndRooty=398600.4418·109x+6378·103
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Expression 2: "y" equals 7.2 9 2 1 1 5 9 times 10 to the negative 5th power times left parenthesis, "x" plus 6378 , right parenthesis times 10 cubedy=7.2921159·10−5·x+6378·103