If 5x + 3y= 12 and 3x + 5y = 20 then what is the value of x + y?
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Answer:
x + y = 4
Step-by-step explanation:
5x + 3y = 12
3x + 5y = 20
(+) (+)
———————
add 8x + 8y = 32
=> 8(x + y) = 8×4
=> x + y = 4
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