Substitution v/s elimination

For SN2 pathway we use an strong nucleophile (OH-,CN-) so they can easily substitute X(halogen) group from rear side.


While for elimination bimolecular reactions we use a strong conjugated base (RCH2O- or alc.kOH) so that it takes proton from carbon near by to halogen,thus forming an alkene .


While in my text book I had found
[![enter image description here](https://i.stack.imgur.com/ThD6M.jpg)](https://i.stack.imgur.com/ThD6M.jpg)


I was agree with first diagram stating that bulky group will more tend to show elimination rather that substitution but in second diagram they show ethoxide ion giving substitution reaction .


To which I disagree, According to me it be should also show elimination reaction.




I think both elimination and substitution reaction will occur any of them can dominate cos ethoxide ion is a strong nucleophile and in presence of a alcohol as a solvent. So the reaction which will dominate depends upon solvent which is not mentioned. Moreover it is also a 2°alkyl halide so solvent is much more important factor.


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