Substitution is the name given to the process of swapping an algebraic letter for its value. Consider the expression 8\({z}\) + 4. This can take on a range of values depending on what number \({z} ...

2 + 64 = 66\). The addition part of the expression has to be worked out last following BIDMAS. This is the final answer. Substitution into formulae works the same way as substitution into ...