Best Answer

An equals sign.

It COULD have variables, but they are not necessary.

For example:

1 + 1 = 2

2 + 2 = 4

2x = 8

y = 4x

y = x2 + 2x + 1

y = 4 (0.5)x

Q: What does an equation always have to have?

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Identity equation

Seems to me like if it's not always true, then it's no equation.

no

will always begin with an equal sign

When in doubt always square both sides of the equation.

Related questions

In math, an equation that is always true is called an identity.

Identity equation

Seems to me like if it's not always true, then it's no equation.

no

an equation ---------- has a soultion? a)always B)sometimes C)never

An example of an equation that will always equal 12 is x=12. x will never change and will always be equivalent to 12.

will always begin with an equal sign

When in doubt always square both sides of the equation.

No

The equation of a straight line can always be put into the form "y=mx+c".

Does a multi-step equation sometimes, always, or never have a solution?

No because you always keep an equation in balance when solving it