Question
The equations 6x + my + 18 = 0 and 9x + 21y + 27 = 0
have a unique solution. Which of the following statements is definitely true?Solution
If two equations a1x + b1y + c1 = 0 and a2x + b2y + c2 = 0 have a unique solution, then (a1/a2) ≠(b1/b2) So, (6/9) ≠(m/21) Or, 'm' ≠14
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