Understanding Line Graphs
What does a line graph show?
Change over time or a relationship between variables.
What is the value of y when x = 2 on the graph?
The y-value that matches x = 2 (based on the graph).
What does it mean if the line goes up from left to right?
The values are increasing.
What is the name of the horizontal axis?
X-axis.
A line graph shows temperature rising all day. What time of day is it?
Morning to afternoon.
What connects the data points in a line graph?
Straight lines.
Which point on the graph has the highest value?
The point with the highest y-coordinate.
What does a downward line show?
The values are decreasing.
What is the name of the vertical axis?
Y-axis.
A heart rate graph rises, then drops. What happened?
Exercise followed by rest.
Why are line graphs useful?
To see trends or patterns in data.
What is the value at x = 5?
The y-value at x = 5.
What does a sudden steep increase suggest?
Rapid growth or change.
What is a "data point"?
A single (x, y) value on the graph.
Sales dip during summer months. What could be the reason?
Seasonal slowdown (e.g., vacations).
What type of variable is usually on the x-axis?
Independent variable (like time).
Between which x-values does the line increase the most?
Where the steepest upward slope appears.
How can you tell if the change is steady?
The line rises or falls evenly between points.
What is the "title" of a graph used for?
To explain what the graph is about.
A student's grades rise each term. What might explain this trend?
Studying more, improving performance.
What does it mean if a line graph has a flat line?
There is no change in the data.
What is the difference in value between x = 1 and x = 4?
Subtract y-values at x = 4 and x = 1.
What kind of pattern does a zigzag line show?
Fluctuating data (rising and falling).
What is the "scale" of a graph?
The numbers used on the axes to measure values.
A graph shows water usage peaking in July. What might be happening?
Summer heat, outdoor water use.