Learn how to substitute math grade 8
Mathematics
ScanSolve AI Answer
Answer
To substitute in math, you replace a variable in an expression or equation with a specific numerical value.
Step-by-step solution
8 stepsIdentify the expression or equation and the variable you need to substitute.
Note the value you need to substitute for that variable.
Rewrite the expression or equation, replacing every instance of the variable with its given value.
Use parentheses around the substituted value, especially if it's negative or if you're multiplying.
Simplify the resulting expression using the order of operations (PEMDAS/BODMAS
Parentheses/Brackets, Exponents/Orders, Multiplication and Division, Addition and Subtraction).
Let's try an example:
If the expression is 3x + 5, and you need to substitute x = 2:The expression is 3x + 5.
The variable is x.
The value to substitute is 2.
Rewrite the expression
3(2) + 5.
Simplify
6 + 5 = 11.
So, when x = 2, the value of 3x + 5 is 11.
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