3x+4y=85 6x+7y=20. Find x and y
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Answered by
8
Given:
3x+4y=85—–(1)
6x+7y=20——-(2)
Multiplying equation (1) by 2 we get,
6x + 8y= 170 ——(3)
Solving equation (2) and (3) we get
6x + 8y= 170
6x+7y=20
(-)____________
y= 150
Substitutng y in equation (1) we get
3x + 4(150)=85
3x + 600=85
3x= – 515
x= -515 / 3
x=171.66
Hence x=171.66 and y= 150
Answered by
3
Given:
3x+4y=85—–(1)
6x+7y=20——-(2)
Multiplying equation (1) by 2 we get,
6x + 8y= 170 ——(3)
Solving equation (2) and (3) we get
6x + 8y= 170
6x+7y=20
(-)____________
y= 150
Substitutng y in equation (1) we get
3x + 4(150)=85
3x + 600=85
3x= – 515
x= -515 / 3
x=171.66
Hence x=171.66 and y= 150
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