Identify equivalent expressions by substituting values
Put the same number in for the letter in both expressions. Work out each side. Equivalent expressions give the same result every time.
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Are 8 + 8p and 4(2p + 2) equivalent? Substitute p = 9 into both.
Answer: Yes
Are 5 + 20y and 5(4y + 1) equivalent? Substitute y = 5 into both.
Answer: Yes
Are 3p + 4 + 3p and 6p + 4 equivalent? Substitute p = 9 into both.
Answer: Yes
Tip: Put the same number in for the letter in both expressions. Work out each side. Equivalent expressions give the same result every time.
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