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3x-4y=8

5x+3y=23
Based on the above system of 2-equations, which of the following values (x+y) equal?
10, 8, 7, or 5

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15 x -20 y = 40
15 x + 9 y = 69
-------------------subtract
-29 y = -29
y = 1

3 x - 4 = 8
3 x = 12
x = 4

x+y = 4 + 1 = 5

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