Q1
What does substitution mean in algebra?
AReplacing a variable with a number
BAdding two variables
CIgnoring variables
DMultiplying variables together
ICSEClass 6 (ICSE)MathematicsCh 20 · Topic 1
Substitution
Substitution in algebra means replacing a variable with a specific number to find the value of an expression.
Core concept
To substitute, we replace the variable in an expression with a given number, then calculate the result.
How it works
For example, if x = 4, then the expression 2x + 3 becomes 2(4) + 3 = 8 + 3 = 11.
Why it matters
Substitution helps us check if a value satisfies an equation or find the value of an expression for specific inputs.
Key detail
Practising substitution builds our understanding of how algebraic expressions relate to actual numerical values.
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• Substitution replaces a variable with a number.
• We then calculate the resulting expression.
• If x=4, then 2x+3 = 2(4)+3 = 11.
• Substitution checks if values satisfy equations.
• It finds expression values for specific inputs.
• Practice builds algebra understanding.
• It connects expressions to real values.
• Substitution is a key algebra skill.