Question

If you have $20, then you spend $10, which direction would the point representing the money you have remaining move on a

horizontal number line?

A. to the left
B. downward
C. upward
D. to the right

Answer 1

The point representing the money you have remaining would move horizontally to the left side of the coordinate system.

Step-by-step explanation:

The point representing the money you have remaining would move horizontally to the left side of the coordinate system.

Answer 2

If you have $20 and spend $10, the point representing the money you have remaining would move to the right, corresponding to (option D).

Step-by-step explanation:

The movement of the point on a horizontal number line is determined by the arithmetic operations performed on the initial amount. In this scenario, starting with $20 and spending $10 involves subtracting $10 from the initial amount. Mathematically, this can be expressed as 20−10=10. Since we are dealing with money, and the convention is to consider spending as a subtraction, the result of $10 indicates the remaining amount. In terms of the number line, moving from $20 to $10 involves a decrease or a leftward movement. Therefore, the correct direction is to the left (option D).

Understanding the representation of numerical operations on a number line is essential for grasping concepts related to arithmetic and finance. In this case, spending $10 results in a leftward movement, indicating a decrease in the amount of money. This foundational understanding is applicable not only in personal finance scenarios but also in various mathematical contexts where the graphical representation of numerical operations plays a crucial role in comprehension and problem-solving.