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If 2x+y=4 and 2x–y=8, then 3x–y = ?
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If 2x+y=4 and 2x–y=8, then 3x–y = ?

User Hamid Ali
by
8.6k points

1 Answer

6 votes
2x + y = 4
2x - y = 8
-------------add
4x = 12
x = 12/4
x = 3

2x + y = 4
2(3) + y = 4
6 + y = 4
y = 4 - 6
y = -2

okay....so x = 3 and y = -2

3x - y = ?
3(3) - (-2) = ?
9 + 2 = 11....so ur answer is 11
User Akash Kava
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8.0k points
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