Which number line shows the solution to −6 − (−4)? a number line is shown from negative 10 to 0 to positive 10. there are increments of 2 on either side of the number line. the even numbers are labeled on either side of the number line. an arrow pointing from 0 to negative 6 is shown. above this, another arrow pointing from negative 6 to negative 10 is shown. a vertical bar is shown at the tip of the arrowhead of the top arrow. a number line is shown from negative 10 to 0 to positive 10. there are increments of 2 on either side of the number line. the even numbers are labeled on either side of the number line. an arrow pointing from 0 to negative 6 is shown. above this, another arrow pointing from negative 6 to negative 2 is shown. a vertical bar is shown at the tip of the arrowhead of the top arrow. a number line is shown from negative 10 to 0 to positive 10. there are increments of 2 on either side of the number line. the even numbers are labeled on either side of the number line. an arrow pointing from 0 to 6 is shown. above this, another arrow pointing from 6 to 10 is shown. a vertical bar is shown at the tip of the arrowhead of the top arrow. a number line is shown from negative 10 to 0 to positive 10. there are increments of 2 on either side of the number line. the even numbers are labeled on either side of the number line. an arrow pointing from 0 to 6 is shown. above this, another arrow pointing from 6 to 2 is shown. a vertical bar is shown at the tip of the arrowhead of the top arrow.