Mapping Diagrams | MathHelp.com - By MathHelp.com
| 00:0-1 | here we are given a relation in the form of | |
| 00:03 | a mapping diagram and were asked if it represents a | |
| 00:07 | function . The easiest way to do this problem is | |
| 00:12 | first translate the mapping diagram into a list of ordered | |
| 00:17 | pairs . Notice that the seven is connected with the | |
| 00:22 | three . The -2 is connected with the -1 , | |
| 00:26 | The zero is connected with the three , and the | |
| 00:29 | five is connected with the four . So we have | |
| 00:33 | the following points . 73 -2 -1 . Yeah , | |
| 00:46 | 03 Yeah . And 54 oh . Now , to | |
| 00:59 | determine if the relation is a function , we can | |
| 01:02 | simply look at the X coordinates of each ordered pair | |
| 01:07 | , Notice that they're all different , 7 -2 , | |
| 01:11 | 0 and five . Therefore this relation must be a | |
| 01:17 | function . So the answer to the question is yes | |
| 01:27 | . It's important to understand that even though two of | |
| 01:31 | the why coordinates are the same , this relation is | |
| 01:35 | still a function . The why coordinates do not have | |
| 01:39 | any effect on whether or not the relation is a | |
| 01:42 | function . |
DESCRIPTION:
This lesson covers subtracting decimals. Students learn to subtract decimals by first lining up the decimal points, then subtracting the numbers by column. For example, to subtract 9.514 -- 1.6, first line up the decimal points, then subtract the digits the thousandths column, to get 4 - 0, or 4, then subtract the digits in the hundredths column, to get 1 -- 0, or 1, then subtract the digits in units column, by borrowing a 1 from the 9 in the units column (which leaves an 8 in the units column), to get 15 -- 6, or 9, then subtract the digits in the units column, to get 8 -- 1, or 7. So 9.514 -- 1.6 = 7.914.
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