evaluate expressions warm up

Evaluate 4y  if       y = 3

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3x + 8   if x = 2

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Evaluate 2a + 4b 
if a = 10     and    b = 6

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Evaluate 2r + 1      if   r = 3

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The difference between an equation and and expression is:

• An equation has an equal sign with an answer, and an expression doesn't.

• There is no difference.

• An expression is like a complete sentence, and equation is similar to a sentence fragment.