Grade 7 maths · N.13 · Simplify expressions
Evaluate expressions with two variables
Replace each letter with its value. Put parentheses around negative values.
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Evaluate −2a + b when a = 5 and b = 2.
Answer: -8
Evaluate 2a + 4b when a = 3 and b = −4.
Answer: -10
Evaluate a + 4b when a = −2 and b = 6.
Answer: 22
Tip: Replace each letter with its value. Put parentheses around negative values.
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