You often need the additive property of equality. It says if a=b then a+c=b+c.
This alone may be enough to solve many equations. Sometimes you need to multiply or divide both sides. This is the multiplicative property of equality.
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None. Properties of inequalities are not that relevant when solving equalities.
By using the quadratic equation formula or by completing the square
Use the equation that shows the relationship between ohms and the properties that are known.
No professions use order of operations. It is just a method of solving an equation.
You don't use unknown variables to solve an equation. The purpose of solving an equation is to find the value of the variable so that it's no longer unknown.