Question

What is the value of Dx for the simultaneous equation 3x+2y+11=0 and 7x-4y=9?​

Answer 1

Answer:

a1 = 3 , b1 = 2 , c1= - 11

a2 = 7 , b2 = -4 , c2 = 9

D = a1 b1

a2 b2

D = 3 2

7 -4

D = 3 × -4 - 2 × 7

= -12 - 14

= - 26

Dx = c1 b1

c2 b2

Dx = -11 2

9 -4

Dx = 11 ×-4 - 2 × 9

= 44 -18

= 26

X = Dx = 26

D -26

= -1

hence Dx is -1 .