exam Maths Puzzle Numerical Ability

Graph the function.

f(x) = -2 - 5

I am not quite understanding the function concept or graphing it. Please help! Thank you!

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exam Other Question

Could someone help me please? The problem is:
A ball is thrown upward from the roof of a building 100m tall with an initial velocity of 20m/s. When will the ball reach a height of 80m? find the slope of the line that passes through (5,2)and (8.,-1)