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## Em5623 Does the matrix 1 , 2 have an inverse? -2 , 4 7 months ago 7 months ago

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1. satellite73

so long as the determinant is not zero, it does

2. itsmylife

calculate the mod of the matrix

3. satellite73

the determinant of your matrix is $$1\times 4-2\times (-2)=8$$ so you should be in good shape