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如何解同解方程~说方法~最好可以举例子
举例
-2x + 3y = 8 --------------------(1)
3x - y = -5 --------------------(2)
3*(2)==>
9x - 3y = -15 -----------------(3)
(1)+(3) ==>
7x = -7
x = -1 ------------------------------(4)
(1),(4) ==>
-2(-1) + 3y = 8
2 + 3y = 8
3y = 6
y = 2