exam Maths Puzzle Numerical Ability

How do i graph an equation?

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exam Other Question

A train leaves NYC for Buffalo, 630 km away, at an average rate of 68 Km/h. At the same time a train leaves buffalo for NYC at an average rate of 58 Km/h. In how many hours will they pass each other? y = 1/3 x
y = 3x
y = -1/3x
y = x + 3

i need help graphing these