book Maths Puzzle Numerical Ability

what is the equation form passing through lines (1,3)and (-1,2)

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book Other Question

At lunch, 5 people out of a group of 9 had hamburgers. What fraction names the part of the group who had hamburgers? What fraction names the part who did not have hamburgers? When using a stair climber, Eric burns 9.6 calories per minute, when he walks on a treadmill he burns 5.3 calories per minute if eric has 50 minutes to excercise and wants to burn