More equations and formulae

Construct and transform more complex formulae

Determine the restriction of variables in a formula

Equations with several variables are called literal equations,

eg: E = mc², etc

The subject of the equation is the variable isolated on one side

For example, y is the subject of the equation y = mx + b.

Rearranging an equation allows a different variable to be the subject.

This is sometimes called solving the equation for a given variable.

Solve y = mx + b for x.

Rearrange the equation to isolate x on one side: y – b = mx

x= ( y - b ) /m

Fractions, roots and some other operations can sometimes restrict the possible values for variables.

For y = a/x, restriction is x not equal to 0

For Vx, x must be greater than or equal 0