Interpretation of a line graph involves relating each plotted point to the labeled horizontal and vertical axes, including the meaning of the scale and intervals, to determine the quantity corresponding to a given category or time. Learners compare values, calculate differences or totals when appropriate, and describe increases, decreases, constancy, peaks, and overall trends; they understand that connected points represent successive measurements in the displayed order. The focus is on reading and reasoning from data, not on statistical modeling, formal rates of change, or extrapolating beyond the graph’s data.
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