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In parts (a) and (b) below, copy the vertical number lines and use them to show the solution to the problems.

  1. Show how to find the answer to on a number line.

  • See parts (a) and (b) for help.

  1. Rachel said that ends up being positive because two negatives always give a positive. Draw the problem on a number line, and then explain whether you agree or disagree with Rachel.

Do two negatives always make a positive?