To represent the situation described in the egg-drop project using equations, we need to consider that the egg starts at a height of 10 feet and falls over time at different rates for each student's parachute design.
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For the first student's design, the egg falls at a rate of 5 feet per second. So, the height of the egg as a function of time (x) can be expressed as: \[ y = 10 - 5x \]
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For the second student's design, the egg falls at a rate of 3 feet per second. Thus, the corresponding equation will be: \[ y = 10 - 3x \]
Combining these two equations, we can express the system of equations as: \[ \begin{cases} y = 10 - 5x \ y = 10 - 3x \end{cases} \]
Therefore, the correct choice that represents the situation described is: \[ {y = 10 - 5x, y = 10 - 3x} \]