Answer: 12. To solve this problem, let's first solve for x. Thi is easiest done by figuring what QR is in terms of x using two equations, both from different lines. In the first line: QR = 15 - 4x. In the third line:QR = 13x - 1 - x = 12x - 1. Now, we have to set these equations equal to each other. 15 - 4x = 12x - 115 = 16x - 116x = 16x = 1 Next, we take line three, 13x - 1, and substitute x as 1. The answer is 12.
