Question

write Dx for the following simultaneous equation:3x + 4y= 8; x-2y= 5​

Answer 1

In cramer's rule of

$\small{ \boxed{ \boxed {\bold\blue {a_1 x+b_1 y=c_1 ,a_2 x+b_2y=c_2}}}}$

${ \boxed{ \boxed {\bold \pink{x= \frac{D_x}{D} = \frac{ \binom{c_1 \: \: b_1}{c_2 \: \: b_2 } }{ \binom{a_1 \: \: b_1}{a_2 \: \: b_2} }}}}}$

${ \boxed{ \boxed {\bold \purple{y= \frac{D_x}{D} = \frac{ \binom{a_1 \: \: c_1}{a_2 \: \: c_2 } }{ \binom{a_1 \: \: b_1}{a_2 \: \: b_2} } }}}}$

${ \boxed { \boxed{\bold \red{{D_x = \binom{c_1 \: \: b_1}{c_2 \: \: b_2}}}}}}$

${ \boxed { \boxed{\bold \green {So \: here \: {D_x = \binom{8 \: \: 4}{5 \: \: - 2}}} {\bold\green= - 36}}}}$