{4x-3y=39,.1 7x+4y=-15.2
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{4x-3y=39,.17x+4y=-15.2{4x-3y=39,.17x+4y=-15.2{4x-3y=39,.17x+4y=-15.24x-3y=39(1)7x+4y=-15(2)(1)×7-(2
{4x-3y=39,.1 7x+4y=-15.2
{4x-3y=39,.1 7x+4y=-15.2
{4x-3y=39,.1 7x+4y=-15.2
4x-3y=39 (1)
7x+4y=-15 (2)
(1)×7-(2)×4 得 -37y=333
∴y=-9,代入(1)得x=3
{4x-3y=39,......(1) 7x+4y=-15......(2)
(1)*7-(2)*4得 -37y=333
y=-333/37(4)
把(4)代入(1)得
x=111/37
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