1 00:00:00,000 --> 00:00:00,860 2 00:00:00,860 --> 00:00:03,790 We're told to solve for y, and we have this inequality that 3 00:00:03,790 --> 00:00:07,480 says that the absolute value of y plus 22 is less than or 4 00:00:07,480 --> 00:00:11,210 equal to 13 and 1/2 or 13.5. 5 00:00:11,210 --> 00:00:14,260 So a good place to start is maybe to just isolate the 6 00:00:14,259 --> 00:00:16,750 absolute value of y on the left-hand side of this 7 00:00:16,750 --> 00:00:17,500 inequality. 8 00:00:17,500 --> 00:00:19,589 And the best way to do that, we can subtract 9 00:00:19,589 --> 00:00:21,649 22 from both sides. 10 00:00:21,649 --> 00:00:25,049 So let's subtract 22 from both sides. 11 00:00:25,050 --> 00:00:27,580 The left-hand side, these guys cancel out, that was the whole 12 00:00:27,579 --> 00:00:30,929 point, so you're just left with the absolute value of y 13 00:00:30,929 --> 00:00:33,149 as being less than or equal to. 14 00:00:33,149 --> 00:00:35,969 And then 13.5 minus 22, let me do it over 15 00:00:35,969 --> 00:00:39,589 here, 13.5 minus 22. 16 00:00:39,590 --> 00:00:42,840 My brain imagines, or the way I process it is, I say, well-- 17 00:00:42,840 --> 00:00:45,760 I always like to put the larger number first-- I say 18 00:00:45,759 --> 00:00:50,539 that's the negative of 22 minus 13.5. 19 00:00:50,539 --> 00:00:56,140 And 22 minus 14 is 8, or the difference between 22 and 14 20 00:00:56,140 --> 00:00:58,840 is 8, so the difference between 22 and 13 and 1/2 is 21 00:00:58,840 --> 00:01:00,430 going to be 1/2 more than that. 22 00:01:00,429 --> 00:01:03,588 So this is going to be 8.5. 23 00:01:03,588 --> 00:01:05,260 So it's going to be negative 8.5. 24 00:01:05,260 --> 00:01:08,700 25 00:01:08,700 --> 00:01:11,780 So we get the absolute value of y is less than or equal to 26 00:01:11,780 --> 00:01:14,219 negative 8.5. 27 00:01:14,219 --> 00:01:18,989 Now, this should cause you some pause, because when you 28 00:01:18,989 --> 00:01:22,009 take the absolute value of anything, what do you know 29 00:01:22,010 --> 00:01:22,859 you're going to get? 30 00:01:22,859 --> 00:01:28,930 If I tell you that the absolute value of any number, 31 00:01:28,930 --> 00:01:30,410 oh, we'll just say the absolute value of 32 00:01:30,409 --> 00:01:32,469 a is equal to x. 33 00:01:32,469 --> 00:01:34,329 What do you know about x? 34 00:01:34,329 --> 00:01:35,950 You know that x is non-negative. 35 00:01:35,950 --> 00:01:41,270 36 00:01:41,269 --> 00:01:44,009 It's either a positive number or 0. 37 00:01:44,010 --> 00:01:47,950 Here we're saying that y is, when we take the absolute 38 00:01:47,950 --> 00:01:50,460 value, has to be less than or equal to a negative number. 39 00:01:50,459 --> 00:01:54,649 It's saying that it has to be a negative number. 40 00:01:54,650 --> 00:02:02,070 This is implicitly saying that the absolute value of y has to 41 00:02:02,069 --> 00:02:04,369 be negative. 42 00:02:04,370 --> 00:02:06,219 It not only has to be negative, it has to be less 43 00:02:06,219 --> 00:02:08,530 than or equal to negative 8.5. 44 00:02:08,530 --> 00:02:10,629 We know that if you take the absolute value of anything, 45 00:02:10,629 --> 00:02:12,689 you're going to get 0 or a positive number. 46 00:02:12,689 --> 00:02:14,469 You're going to get a non-negative number. 47 00:02:14,469 --> 00:02:16,840 There's no number you can put here whose absolute value's 48 00:02:16,840 --> 00:02:19,240 going to give you a negative number, especially one less 49 00:02:19,240 --> 00:02:21,530 than negative 8.5. 50 00:02:21,530 --> 00:02:24,460 So there is no solution to this problem. 51 00:02:24,460 --> 00:02:27,770 You cannot find a y that will satisfy this. 52 00:02:27,770 --> 00:02:30,939 So there is no solution. 53 00:02:30,939 --> 00:02:34,332