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Janusz Asked
Age 16 to 18
Challenge Level 
For $y = ax + b$, if you can use the given conditions and write $b$
in terms of $a$, then for any value of $a$ there will be a linear
function with this property.
For the second part use the formula relating the sum of the roots and the coefficients and then work systematically to consider all cases.
For the second part use the formula relating the sum of the roots and the coefficients and then work systematically to consider all cases.
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