Cramer’s rule:
The solution of the simultaneous equations
{a1x+b1y=d1a2x+b2y=d2
is given by the formulae
x=∣∣a1a2b1b2∣∣∣∣d1d2b1b2∣∣ y=∣∣a1a2b1b2∣∣∣∣a1a2d1d2∣∣
(i) {x−y=0x−y=1
This system has no solution.
ii){x−y=0x+y=0
This system has a unique solution.
(iii) {x−y=12x−2y=2
This system has infinitely many solutions.
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