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Solve the equation using crammer's rule: X -3Y =277X +2Y =9?

1 answer

Assuming you meant
x -3y = 27
7x +2y = 9
then we have
D =
|1 -3|
|7 2| = 23

Dx =
|27 -3|
|9 2| = 81

Dy =
|1 27|
|7 9| = -180

x = Dx/D = 81/23
y = Dy/D = -180/23
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