Graphs are visual representations of relationships between two or more variables.
CONSTRUCTION OF A GRAPH
The intercepts of a graph are the places where the curve intersects the y- and x-axes. The y-intercept shows the value of the y-variable when the x-variable is zero. The x-intercept shows the value of the x-variable when the y-variable is zero.
Slope of a graph=(change in the y variable)/(change in the x variable)
Taking an example here: We are interested in graphing the number of students enrolled in college across time.
1.OBTAIN DATA:
We can obtain data on this relationship from the U.S. Department of Education's National Center for Education Statistics.
2.DRAW AND LABEL AXES:
PLOT POINTS:
4.DRAW THE CURVE: