Question

(i) 3х + 2y = 4
8х + 5у = 9​

Answer 1

*8 24x+16y= 32

*3 24x+15y=27

(-) (-) (-)

1y =5

y=5

substitute y in 3x+2y=4

3x+2(5)=4

3x=10-4

x= 6/3

x=2

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Answer 2

Answer:

Correct option is

B

x=−2,y=5

x=−2,y=5

8x+5y=9

By multiplying the above equation by 3, we have

24x+15y=27⟶(1)

3x+2y=4

Again by multiplying the above equation by 8, we have

24x+16y=32⟶(2)

Subtracting eqn

(1) by (2), we have

24x+16y−(24x+15y)=32−27

⇒24x+16y−24x−15y=5

⇒y=5

Substituting the value of y in eqn

(2), we have

3x+2×5=4

⇒3x=−6

⇒x=−2

∴x=−2,y=5

Step-by-step explanation:

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