What is the equation for time when using a position-time graph?
and
what is the equation for displacement when using a velocity-time graph?

This really depends on the graph but to approach these types of problems you can go about it this way (check explanation)...

Explanation:

(1) What is position?

Where is the object's location at?

If slope is zero, velocity is zero (straight line)

Slope positive, velocity is constant/ positive (linear line positive)

Object is accelerating.. curve upwards.

Steeper the slope, higher the speed

(2) What is velocity?

What are velocity vs. time graphs? - Khan Academy

so here is the information for current research:

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-a geothermal heat pump system consists of a heat pump, an air delivery system (ductwork), and a heat exchanger-a system of pipes buried in the shallow ground near the building

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more than, less

less than, more