What makes an equation linear??

Question

Ya i knew the answer when i learned it but now i forgot =[

help please!!!!

Answer 1

When the exponent of the first term of an equation is equal to 1.

example. x+2

*the equation is linear since the exponent of x is 1

*if the exponent of the first term is 2 and above, its not a linear equation

Answer 2

An equation is linear if it has a variable raised to the first power. So you can't have x squared or anything higher than x