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If 2x+y=23 and 4x-y=19 then the value of (5y-3x) and (y/x-2) are: |
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Answer» By elimination method we have: 2x + y = 23 ...?➡️ 4x - y = 19 ...?➡️➡️ 6x = 42 ....?➡️➡️➡️From eq.3 we have x = 7On substituting value of x in any of the eq: (let be in eq.2)2x + y = 23➡️ {We know, x=7}2(7)+y = 23➡️14+y = 23➡️y = 23-14➡️y = 9➡️➡️➡️Now, we have values of both x and y {x=7; y=9}➡️➡️➡️Final ques➡️Find value of (5y-3x) and (y/x-2)➡️➡️➡️Part-1➡️5y-3x {x=7; y=9}➡️5(9)-3(7)➡️45-21➡️Ans [24]➡️➡️➡️➡️Part-2➡️y/x -2 {x=7; y=9)➡️9/7 -2➡️9/7 -14/7➡️Ans [-5/7]➡️ By elimination method we have: 2x + y = 23 ...?➡️ 4x - y = 19 ...?➡️➡️ 6x = 42 ....?➡️➡️➡️➡️➡️➡️From eq.? we have x = 7➡️➡️➡️➡️➡️➡️➡️On substituting value of x in any of the eq: (let be in eq.?)➡️➡️➡️➡️➡️➡️2x + y = 23 {We know, x=7}2(7)+y = 2314+y = 23y = 23-14y = 9➡️➡️➡️➡️➡️➡️Now, we have values of both x and y {x=7; y=9}➡️➡️➡️➡️➡️➡️Final quesFind value of (5y-3x) and (y/x-2)➡️➡️➡️➡️➡️➡️Part-15y-3x {x=7; y=9}5(9)-3(7)45-21Ans [24]➡️➡️➡️➡️➡️➡️Part-2y/x -2 {x=7; y=9)9/7 -29/7 -14/7Ans [-5/7] By elimination method we have: 2x + y = 23 ...1 4x - y = 19 ...2➡️ 6x = 42 ....3From eq.3 we have x = 7On substituting value of x in any of the eq: (let be in eq.2)2x + y = 23 {We know, x=7}2(7)+y = 2314+y = 23y = 23-14y = 9Now, we have values of both x and y {x=7; y=9}Final quesFind value of (5y-3x) and (y/x-2)Part-15y-3x {x=7; y=9}5(9)-3(7)45-21Ans [24]Part-2y/x -2 {x=7; y=9)9/7 -29/7 -14/7Ans [-5/7] |
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