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Home > MC2 > Chapter 2 > Lesson 2.1.2 > Problem 2-30


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


    The answer is where the point moves to.


  1. Show on a number line.

    See parts (a) and (b) for help.

  2. Rachel said that will be positive because two negatives always give a positive. Draw the problem on a number line, then explain whether you agree or disagree with Rachel.

    A number line is divided into 10 equal parts. It has 11 tick marks and labeled as follows: First tick mark is negative 7, eighth tick mark is 0, and eleventh tick mark is 3. It has starting point located at negative 4 moving 3 units to the left to negative 7.
    Explain why a negative number plus a negative number is always a negative number.