Question

find Cramer's rule..x+2y=-1;2x-3y=12​

Answer 1

Answer:

x+2y=-1;

2x-3y=12

$x = - 1 - 2y$

Put x in -

$2x - 3y = 12 \\ 2( - 1 - 2y) - 3y = 12 \\ - 2 - 4y - 3y = 12 \\ - 7y = 14 \\ y = - 2$

And,

$x = - 1 - 2y = - 1 - 2 \times ( - 2) \\ x = - 1 + 4 = 3$