Since the bottom side is equal to 3 of the small triangle and the side of the larger triangle is equal to 9, that means that it was dilated by a factor of 3, since 3 * 3 = 9 So, the other side of 5, of the smaller triangle needs to be also be dilated by a factor of 3, so the new side is 15. The larger triangle tells us that the side is x + 1, but we know that it is equal to 15. Since they are the same, we make them equal and solve for x So, 15 = x + 1 We subtract 1 to isolate x and we get 14 = x So, x is equals to 14. I hope this helps. YOU'RE WELCOME :D
