The length of a rubber cord is l(1) m w...

The length of a rubber cord is `l_(1)` m when the tension is 4 N and `l_(2)` m when the tension is 6 N.The length when the tension is 9 N, is

`5l_1-4l_2`

`5l_2-4l_1`

`9l_1-8l_2`

`9l_2-8l_1`

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