Question

(A) 4
(2) for simultaneous equations in va
(A) 7
(3)Find the value of %, 3.​

Answer 1

Answer:Correct option is

B

x=

5

2

​

,y=

5

−1

​

Given equations are 3x+y=1 and 2x=11y+3

For cramers rule, We first find

D=(

3

2

​

1

−11

​

)

⇒∣D∣=

∣

∣

∣

∣

∣

∣

​

3

2

​

1

−11

​

∣

∣

∣

∣

∣

∣

​

=3×−11−1×2=−33−2=−35

For x matrix

D

x

​

=[

1

3

​

1

−11

​

]

⇒[D

x

​

]=

∣

∣

∣

∣

∣

∣

​

1

3

​

1

−11

​

∣

∣

∣

∣

∣

∣

​

=1×−11−1×3=−11−3=−14

For y matrix

D

y

​

=[

3

2

​

1

3

​

]

⇒[D

y

​

]=

∣

∣

∣

∣

∣

∣

​

3

2

​

1

3

​

∣

∣

∣

∣

∣

∣

​

=3×3−1×2=9−2=7

Therefore, x=

D

D

x

​

​

=

−35

−14

​

=

5

2

​

and y=

D

D

y

​

​

=

−35

7

​

=−

5

1

​

Answer is option B.

Step-by-step explanation: