I am using a Casio graphing calculator's Picture Plot feature.
I am trying to find the equation which models a rollercoaster.
I have plotted the equation as seen below:
Through quartic regression, I'm able to get the equation:
$$0.31~x^4 -0.38~x^3 - 2.5~x^2 + 0.52$$
Though this is an equation in which each interval (each mark on the axes) represents 1 unit. In reality the roller coaster section seen has a height of 107m and a length of 20m (length is hypothetical).
I'm unable to realize how to change the equation to account for this.