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