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3(2x+y)=7xy; 3(x+3y)=11xy by elemination method |
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Answer» Answer: x = 1 and y = 3/2 Step-by-step explanation: 3(2x+y) = 7xy 6x + 3y = 7xy ---------(1) 3(x+3y) = 11xy 3x + 9y = 11xy ---------(2) on multiply by 3 in eq 2 2(3x + 9y = 11xy) 6x + 18y = 22xy -------(3) on SUBTRACT eq 1 and 3 6x + 3y = 7xy 6x + 18y = 22xy - - - 15y = 15xy 15y/15y = x 1 = x put x in eq 1 6x + 3y = 7xy 6(1) + 3y = 7(1)y 6 + 3y = 7y 6 = 7y - 3y 6 = 4Y 6/4 = y 3/2 = y |
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