exam Maths Puzzle Numerical Ability

Can you show me a graph for the slope of these lines?
(a) 1/2
(b) -2
(c) -1/2
(d) 2

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exam Other Question

At the instant the traffic light turns green, an automobile starts with a constant acceleration A of 2.5 m/s^2. At the same instant a truck, travelling with a constant speed of 7.2 Solve for x.

1/x + 1/x+16 = 1/15

The solutions are x = ________.