2X-3y=-5,3x-2y=12怎么做
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-22x - 3y = -5 (1)
3x - 2y = 12 * 3 (2)
(1)* -2得 -4x + 6y = 10(3)
(2)*-2得 9x - 6y = 36(4)
∴(3 )+ (4) 5x = 46
∴ x = 9.2(46/5)
∴y = 7.8(39/5)
3x - 2y = 12 * 3 (2)
(1)* -2得 -4x + 6y = 10(3)
(2)*-2得 9x - 6y = 36(4)
∴(3 )+ (4) 5x = 46
∴ x = 9.2(46/5)
∴y = 7.8(39/5)
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