Math, asked by moulipriyadarshi34, 1 year ago

the coefficient of variable y in the linear equation5(2x-y)+3x+4y-7=0 is​

Answers

Answered by nancychaterjeestar29
1

Answer:

x,y)=(8,2)

Step-by-step explanation:

(i) 3x−4y=7;5x+2y=3

3x−4y=7⇒       3x−4y=7

2(5x+2y=3)⇒ 10x+4y=6

13x+0=13

x=1 ⇒ 5+2y=3⇒ y=−1

∴ (x,y)=(1,−1)

(ii) 5x+7y=17;3x−2y=4

3(5x+7y=17)⇒15x+21y=51

5(3x−2y=4)⇒15x−10y=20

31y=31⇒ y=1⇒ 3(x)−2=4⇒ x=2

∴ (x,y)=(2,1)

(iii)  x−2y=−10;3x−5y=−12

3(x−2y=−10)⇒ 3x−6y=−30

3x−5y=−12

−x=18⇒x=18

18−2y=−10⇒ y=14

∴ (x,y)=(18,14)

(iv)  4x+y=34;x+4y=16

4x+y=34⇒ 4x+y=34

4(x+4y=16)⇒ 4x+16y=64

−15y=−30

⇒ y=2

4x+2=34

⇒ x=8

⇒ (x,y)=(8,2)

         

#SPJ2    

Similar questions