How to read a graph?

Answer 1

A graph has two axes, the one running top to bottom (vertical or y axis) and one running right to left (horizontal or x axis). You can run your finger up the y axis to the point where it is at the same height as the point on the line you are interested in, and note the number on the y axis, then run your finger across to the point on the line you are interested in, then take your finger down to the x axis and note the number of that axis, then combine the two.

For example, if the graph shows height on the y axis and time on the x axis, you go up the y axis to say, 23 cm, then across to the point on the line, then down to the x axis which is say, 12 hours, then you know that by 12 hours the plant (for example) had grown 23 cm.