Book Maths Puzzle Algebra

x+2y=5

3x-y=1

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Book Other Question

How do I find the height of this quadratic word problem?
If a ball is thrown straight up with an initial velocity of 48 feet per second, its height s after t seconds is given by the equation s=48t-16tsquared. Find the maximum height attained by the ball and the time it takes for the ball to return to earth.
solve by using the Quadratic Formula: x^2+11x+18=0