Point a is a point representing -3 on the number axis. When moving from point a to the right along the number axis by 4 unit lengths to b, what is the number represented by point b?
点a为数轴上表示-3的点，从点a沿数轴向右移动4个单位长度到b时，点b所表示的数为多少
<gadget id="calculator">(-3) + 4</gadget>
<output>1</output>

<result>1</result>