Question

to solve x + y = 3; 3x – 2y – 4 = 0 by determinant method,find Dx

(A) 5 (B) 10 (C) -5 (D) -10​

Answer 1

Answer:

$3x - 2y - 4 = 0 \\ (c) - 5is \: the \: right \: answer$

Answer 2

Answer:

x+y=3 ___i ×2

3x-2y=4___ii ×1

by equation ---i

x=3-y______ iii

determined eq.iii in ii

3(3-y)-2y=4

9-3y-2y=4

-5y= -5

so, y=1.

then, the value of y determined eq. 1

x+y=3

x+1=3

x=2.