Question

what is the answer ​

Answer 1

Step-by-step explanation:

x+y=9

y=9_x

1/x+1/y=1/2

1/x+1/9_x=1/2

(9_x+x)/9x_x²=2

9x_x²/9_2x=2

9x_x²=18_4x

x²_12x+18=0

solve this way

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