Ennuyerais vs ennuieras

Question

In the above examplers, it shows both "payeras" and "paieras" as being valid.
So why is "Je m'ennuierai à cette fête" considred correct, while "
Je m'ennuyerai à cette fête" was not?
Is it only "-ayer" verbs that allow the two alternatives?

Accepted Answer

Rebecca, yes, it is only ‘-ayer’ verbs that have this particular alternative. 
From the lesson : 
“ ATTENTION: 
Verbs in -AYER, in spoken French (included written dialogue in a play for example) also accept an alternative version where the y is kept (and also pronounced differently) “ 
Many dictionaries, Laura Lawless and other sites have conjugation tables that are useful references :
 https://progress.lawlessfrench.com/revision/grammar/conjugate-semi-regular-oyer-ayer-uyer-verbs-in-le-futur-future-tense 
https://www.wordreference.com/conj/frverbs.aspx?v=payer
 https://www.lawlessfrench.com/verb-conjugations/ennuyer/
 https://www.wordreference.com/conj/frverbs.aspx?v=ennuyer
 https://www.lawlessfrench.com/verb-conjugations/payer/