A scientist measures how the total pressure varies with depth below the surface of a freshwater lake.
They plot a graph with total pressure on the yyy-axis and depth on the xxx-axis. Both atmospheric pressure and the pressure due to the water are taken into account.
Which of the following mathematical equations represents how the total pressure varies with depth?
y=mxy = mxy=mx
y=mx+cy = mx + cy=mx+c
y=kxy = \frac{k}{x}y=xk
y=ax2+cy = ax^2 + cy=ax2+c