If RS = 23 - 2x, ST = 9x - 5 and RT = 39 and S is between R an T, find RS.
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Given : RS = 23 - 2x, ST = 9x - 5 and RT = 39 and S is between R an T,
To Find : RS
Solution:
Using Addition of segment postulate
RS + ST = RT
AS S is between R & T
RS = 23 - 2x
ST = 9x - 5
RT = 39
=> 23 - 2x + 9x - 5 = 39
=> 18 + 7x = 39
=> 7x = 21
=> x = 3
RS = 23 - 2x
=> RS = 23 - 2(3)
=> RS = 23 - 6
=> RS = 17
RS = 17
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