Think of an equation as a scale. If we change one side of the equation, we have to do the same thing to the other side to keep the equation balanced (true).
Try playing around with the scale below to see for yourself!
Now let’s take a look at another equation:Notice that this equation mostly just has numbers, but it also has an in there. This is what we call a variable.
In math, a variable is a symbol, usually a letter like , that represents a number or value we don’t know yet but want to find.This equation is also an example of a linear equation. A linear equation is an equation that does not have any variables with exponents, and when graphed, forms a straight line.