Posted by momo on Monday, November 21, 2011 at 12:13am.
substitute y = 20 - 9.8x
into the first equation:
20 - 9.8x = -4.9 x^2 + 20x + 10
4.9 x^2 - 29.8x + 10 = 0
x = 5.725 or 0.356
and you can get y.
These are strange equations to "solve" since one is the equation of motion of a body, and the other is the equation of its velocity.
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