EASY SUBSTITUTION.

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Presentation transcript:

EASY SUBSTITUTION

This process is called substitution Sometimes we are asked to evaluate (find the value of) an expression when we are given the numeric value of the letters Evaluate a + 2 when a=4 a + 2 = 4 + 2 = 6 This process is called substitution

If b=3 give the value of: 2b + 5 = 2 x b + 5 = 2 x 3 + 5 = 6 + 5 = 11

If e=7 give the value of: 5e - 10 = 5 x e - 10 = 5 x 7 - 10 = 35 - 10 = 25

If a= 5 and b=2 give the value of: 3a - 4b = 3 x a - 4 x b = 3 x 5 - 4 x 2 = 15 - 8 = 7

If a=3, b=4 and c=2 give the value of: a + 4c - b = a + 4 x c - b = 3 + 4 x 2 - 4 = 3 + 8 - 4 = 7