exam Maths Puzzle Numerical Ability

I do not understand how they got the answer they got in the back of the book.

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exam Other Question

The graph shows data collected by measuring the height, h, in
centimeters, of a burning candle at different times, t, in minutes.
Which of the following equations best represents the line drawn
through the data points? a=1/2h(a=b) sloving for: h