Tickets to a play cost $5 for adults and $2 for children. If 1,750 tickets were sold for a total of $7,100, how many children's tickets were sold?

Can someone explain me how to make this one step by step?

Label adults ticket x and child's ticket y

And then use simultaneous equations

Okay so you have 1750 tickets and 7100 dollars so you gotta do

7100 divided by 5 wich gives you the amount of adult tickets which is 1420 you then have to take 1420 away from 1750 which leaves you with 330