exam Maths Puzzle Numerical Ability

Find the slope if it exsists.
x+6y=12

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exam Other Question

A ball is thrown upward from the roof of a building 100 m tall with an initial velocity of 20 m/s.

When will the ball reach a height of 80m?

I would appreciate help with this one. Thank you!
Find the slope of the line that passes through the given points.
(0,0), (3,9)