exam Maths Puzzle Numerical Ability

STATE THE DOMAIN AND RANGEOF THE RELATION
{(3,2),(-5,7),(-4,3)
D=
R=

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Please help me solve this i have no idea what to do: determine the unknown coordinate so that the line containing the points has the given slope: (-3,y) and (2,-2) m= -1 Simplify the product : (x/2-2/5)(2/5-x/2)-x^2+2x