Learn how to solve a system of equations by substitution. To solve a system of equations means to obtain a common values of ...

In this video I will explain the only times I want students to use substitution over elimination. The reason for this is that ...

Substitution means putting numbers in place of letters to calculate the value of an expression. The bracket has been worked out first. \(2 + (-8)^2 = 2 + 64\). \(-8^2\) means \(-8 \times -8\), which ...

For example, in the expression \(2b^2c\), where \(b = 4\) and \(c = 3\), use the values of \(b\) and \(c\) to calculate the numerical value of the expression: The ...