Is there any difference between an equation with one variable and one equation with two variables?

Answer 1

no....

Answer 2

What is a variable? It might be x or y or b or w.
A one variable equation has one of those; a two variable equation has two of them.
2X + 14 = cost of ham. 1 variable.
2X+3Y = coat of ham. 2 variables.

Answer 3

Thanks a bunch :)

Answer 4

a variable takes the plase of a number. for example 2+a=4 someetimes they might tell you wut the variable stands for- a=2 so then you answer is 2+2=4.