Tracey M. answered • 07/05/18

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Hi Murtaza,

here is a kind of picture

P--------Q--------R

PQ =2z and that is half the length of PR

PR = 8z - 12

PQ = (1/2)(8z - 12)

2z = 4z - 6

6 = 2z

3 = z

so PQ = 2z = 2(3) = 6

**PQ = 6**

PR = 8(3) -12 = 24 -12 = 12

**PR =12**