We have looked at how to solve equations with one unknown value, but what happens when there are two unknown values? An equation with two unknown values will have infinitely many solutions.

A dictionary listing for "deja vu" ...

Bar models can be used to solve simultaneous equations. See how in this Bitesize KS3 maths video.

RAVEN is a flexible and multi-purpose probabilistic risk analysis, validation and uncertainty quantification, parameter optimization, model reduction and data knowledge-discovering framework.