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friedrice821
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I'm looking for an algorithm to create a very simple (2 equations, 2 unknowns) linear system of equations that consists purely of integers. Specifically, a way to create a system of equations of integers and knowing that it can only be solved by integer answers, without actually solving it.
a11x1+a12x2=b1
a21x1+a22x2=b2
where a11, a12, a21, a22, x1, x2, b1, b2 are all integers.
The only thing I can think of is using a determinant which gives
x1 = (a22b1-a12b2) / (a11a22-a12a21)
x2 = (a11b2-a21b1) / (a11a22-a12a21)
and that the numerator must be a multiple of the denominator.
What do I do now? Am I even on the right path?
a11x1+a12x2=b1
a21x1+a22x2=b2
where a11, a12, a21, a22, x1, x2, b1, b2 are all integers.
The only thing I can think of is using a determinant which gives
x1 = (a22b1-a12b2) / (a11a22-a12a21)
x2 = (a11b2-a21b1) / (a11a22-a12a21)
and that the numerator must be a multiple of the denominator.
What do I do now? Am I even on the right path?
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