Math, asked by lalitarchita2004, 1 year ago

substitution method for Linear Equations in two variables 3x+y=6 , 3x-2y=12

Answers

Answered by Anonymous

given equation :

3x+y=6. ...(1)

3x-2y=12. ...(2)

by (2)

x=(12+2y)/3

put in (1),

3(12+2y)/3+y=6

12+2y+y=6

3y=-6

y= -2

and

x= 8/3

I hopes its helps u.

please follow me!!

@Abhi.

lalitarchita2004: according to u , x=12-2y/3 but while substituting in eq (1) , u have taken x=12+3y/3 . im not able to understand how this came

mahak7780: I am not able to understand what you are asking

lalitarchita2004: hoo it is correct i just got confused sorry..

lalitarchita2004: thank u..

Answered by mahak7780

Answer:

3x+y=6...(i),3x-2y=12... (ii)

y=6-3x.......(iii)

Put value of y in eq(ii)

3x-2(6-3x)=12

3x-12+6x=12

9x=12+12

9x=24

$\frac{24}{9}$

$x = \frac{8}{3}$

Put value of x in eq (iii)

$y= 6 - 3 \times \frac{8}{3}$

y=6-8

$y = - 2$

HOPE THIS WILL HELP YOU

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