Book Maths Puzzle Quadratic Equations

How do i write the quadratic equation used to find the time when the rocket reaches 80 ft. if y=55+33t-5t^2 where y is the height and t is the tim ethe rocket has been in the air?

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Book Other Question

Please help me with a step by step process for solving linear equations. My problem is:
x + y = 4
x - y = 5
I don\'t know what the first step should be. Find the slope and y-intercept of the graph of each equation for:
(2/3)x + (1/6)y = 2