InterviewSolution
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InterviewSolution
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If x+y=3 and 3x+2y=4 the value of negative of x is |
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Answer» 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 x = -2 By method of eliminationLet, 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 \xa0x+y=3 -------- (i)\xa03x+2y=4 ......... (ii)Multiply (i) by 2 and subtract from (ii)3x + 2y = 42x + 2y = 6____________x = -2 -2 |
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