If PQ = x – 5, QR = 2x – 1, and PR = 21, find x. x =
We know PQ+QR=PR
So, "(x-5)+(2x-1)=21"
"So, 3x-6=21"
So "3x=21+6=27"
So "x=\\frac {27} {3} =9" (Ans.)
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