2. 外语
  3. Solve each of the following systems of equations for x and y. (a)x + y = 24 x-y = 18 (b)3x-y = -5 x + 2y = 3 (c)15x-18-2y = -3x

Solve each of the following systems of equations for x and y. (a)x + y = 24 x-y = 18 (b)3x-y = -5 x + 2y = 3 (c)15x-18-2y = -3x

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问题 Solve each of the following systems of equations for x and y.
(a)x + y = 24
x-y = 18
(b)3x-y = -5
x + 2y = 3
(c)15x-18-2y = -3x + 7
10x + 7y + 20 = 4x + 2
选项
答案(a)x=21 y=3 (b)x=-1 y=2 (c)x=1/2 y=-3
解析
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