formula of cross multiplication method
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Linear Equations in 2 Variables. Step 5: if a1b2 – a2b1 ≠ 0 or a1/a2 ≠ b1/b2, then equation has definite solution. When a1/a2 = b1/b2 = c1/c2 , then there are infinitely many solutions. When a1/a2 = b1/b2 ≠ c1/c2, then there is no solution.
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