解下列方程 8x+9y=17 x-3y=-2
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8x + 9y = 17,
x - 3y = -2,
这个方程组,
x - 3y = -2,
3x - 9y = -6,
3x - 9y + 8x + 9y = -6 + 17,
11x = 11,
x = 1,
x - 3y = -2,
1 - 3y = -2,
3 - 3y = 0,
1 - y = 0,
y = 1,
解方程组,
x = 1,
y = 1,
x - 3y = -2,
这个方程组,
x - 3y = -2,
3x - 9y = -6,
3x - 9y + 8x + 9y = -6 + 17,
11x = 11,
x = 1,
x - 3y = -2,
1 - 3y = -2,
3 - 3y = 0,
1 - y = 0,
y = 1,
解方程组,
x = 1,
y = 1,
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