Person's email for 1 week has 79 emails. Spam messages were 4 more than twice the number of other messages. How many spam messages?

Let x be spam, y be email.

I have this, is this right. But stuck after that on what to do, even if that is correct.

4x+2y=79?????

Need this done in a linear equation for this.

HELP please, thanks.

Joanne