In a line-graph data interpretation item, which element should you read to understand what numbers represent?

• A. The axis labels.
• B. The legend colors.
• C. The shading.
• D. The font style.

Answer: (A)

Understanding a line graph starts with reading the axis labels, because they tell you what quantities the numbers represent and what units are being used. The numbers on the vertical axis show the measured value and its units (for example, temperature in °C or revenue in dollars), while the horizontal axis usually indicates time or categories. This scale is what you compare data points against to interpret their meaning. The legend tells you which line corresponds to which dataset, but it doesn’t define what the numbers mean. Shading or font style don’t establish numeric meaning. So, axis labels are the key to knowing what the numbers represent.