book Maths Puzzle Numerical Ability

what are the x and y coordinates of y=-1
thanks!

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book Other Question

Is there a formula that could be used to explain how you add consecutive numbers to make multiples of 100.eg.18+19=19=20=21=22=100 38+39+40+41+42=200 that would be suitable for a twelve year old to be able to solve such problems? Determine the reference angle 0' for the given angle 0=200