Solve each of the following systems of equations for x and y.(a)x + y = 24x-y

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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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Solve each of the following systems of equations for x and y.(a)x + y = 24x-y

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Thepassageismainlyabout______.[br]WhichofthefollowingisNOTmentioned

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ETF的建仓期不超过（）。A.1个月 B.3个月 C.2个月 D.4个月

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