Help with diophantine equation please

[pulsar swan]

The problem here states that to find all possible x and y digit pairs satisfying this equation:

[undone shore]

what are those symbols? like the line above and the dot between x•y

[pulsar swan]

Oh right

Thats indicating that it is a number

X and y is indicating different digits

So x and y are 1 digit numbers because its resembling digits in a number itself

[undone shore]

so for example if x=1 and y=2 then xy=12?

[pulsar swan]

Yes

[undone shore]

and what's the dot between x•y mean?

[pulsar swan]

That is multiplication

[undone shore]

oh
the line above indicates that x and y are digits?

[pulsar swan]

Yes

[undone shore]

but 1979 isn't a square number so therefore xy cannot be a whole number

[pulsar swan]

Here it is, straight from the book

[undone shore]

I don't think there're any x and y pairs cuz 1979 is not a square number

[pulsar swan]

This is what my half drunk math teacher on Saturday morning class gave me

@undone shore

[undone shore]

but 87² ≠ 1979

[pulsar swan]

Please forgive, my math teacher was half drunk, half hungover, reeked badly of intense alcohol and cigarettes smell that i almost passed out when i stood next to him

[undone shore]

lmao

[pulsar swan]

Then i assume this question is unsolvable?

[undone shore]

yes

[pulsar swan]

Well, solving problems from a book that is from 2005 can be quite problematic then

[pulsar swan]

+close