However, there may be circumstances where the relationship between the variables is non-linear (i.e., does not take the shape of a straight line), and we can draw other shaped lines through the ...

Figure 1a. Graph for y = 3x + 4. Figure 1b. Graph for y = 2x 2 - 3x + 4.. Figure 1c. Graph for y = 0.6x 3 + 2x 2 - 3x + 4.. In school I also had the x- and y-axes represent something, such as age ...