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Substitution
GCSE (grade 3 topic)
Date : 25/05/2023
Substitution means putting a number into a formula or expression in place of a letter
Example 1: Find the value of 4a + b when a = 5 and b = 3In this question we are going to change a into 5 and b into 3We cannot write 45 + 3 because 4b means 4 times bWe can instead use brackets to substitute the numbers into the expression:4(5) + (3)This resource was uploaded by: Zaidah