exam Maths Puzzle Numerical Ability

what is y when (2, y), (4, 5), m= 2
what is y when (-5, 3), (3,y), m= -1/2
what is y when (-1, 5), (3,y), m= 5
what is y when (5, 7), (8, y), m= 4/3
what is y when (2, -15), (5, y), m= 4/5

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exam Other Question

divide and simplify

x-7 (x+5)(x-7)
--------/---------------
9(2x-1) 6x(x+5)
2.43x + 13.71 = 8.12x - 22.54