A line graph represents how a quantitative variable changes across an ordered context, often time, by using labeled axes, an appropriate scale, plotted points, and connecting segments. Interpretation includes reading exact values, comparing values, identifying increases, decreases, constant intervals, peaks, lows, and overall trends, while recognizing that connecting segments show visual change between observations rather than automatically providing measured values at every intermediate point; formal interpolation, rate-of-change analysis, and statistical modeling are not included.
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