Name the compound formed by a cyclohexene ring in which one sp2 carbon carries a methyl group and the sp3 carbon next to the other sp2 carbon carries an ethyl group.

In a cycloalkene the double-bond carbons are C1 and C2. The ring is numbered in the direction that gives the substituents the lowest locant set. Starting at the methyl-bearing sp2 carbon puts the ethyl on C3, giving {1,3}; the other direction gives {2,6}. Prefixes are cited alphabetically, so the name is 3-ethyl-1-methylcyclohexene.