exam Maths Puzzle Numerical Ability

graph the inequality.
x-y>2

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exam Other Question

Suppose a scientet makes two measurements x1 and x2 of a quantity whose true measure x is not known. The errors are then x-x1 and x-x2. What number can be assigned to x so that the sum of the squares is a mininum? solve.
{5x+ 2y=28 and 3x-4y=48