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If x+y=3 and 3x+2y=4 the value …

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If x+y=3 and 3x+2y=4 the value of negative of x is

Posted by Arham Hussain 4 years, 10 months ago

CBSE > Class 10 > Mathematics

5 answers

Sushant Sharma 4 years, 10 months ago

We have x+y=3 ----------(i) and. 3x+2y=4 --_------(ii) From eq-(i). we'll get y=3-x -----(iii) Now put the value in eq-(ii) We ll get ,,,,, ::. :: 3x+2(3-x)=4 3x+6-2x=4 3x-2x=4-6 x=-2 Hurray ?????We solve it

King Adithya H M... 4 years, 10 months ago

x = -2

Paul Mongku 4 years, 10 months ago

By method of elimination Let, x+y=3......(1) 3x+2y=4.....(2) Multiply (1) by 3 we get, 3x+3y=9......(3) Now, subtract (2)from(3) 3x+3y= 9 - 3x+2y= 4 - - ______________ Y=5.....(4) Again substitute (4) in (1) we get, x+5=3 x =3-5 x = -2 ....ans

Yogita Ingle 4 years, 10 months ago

x+y=3 -------- (i)

3x+2y=4 ......... (ii)

Multiply (i) by 2 and subtract from (ii)

3x + 2y = 4

2x + 2y = 6

____________

x = -2

Arham Hussain 4 years, 10 months ago

-2

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