Idea 12of 13Builds onSubtract to find the slide
Undo a slide
How do you slide a point back to where it started?
Today you'll discover
- what stays the same in the way back
- what flips in the way back
Think firstA slid to B: 8 right, 7 down
Which slide takes B back to A?
Decide first, then press Next. Keep the numbers; flip the directions.
A coordinate grid with A at (3, 12) and B at (11, 5). An L-shaped arrow goes from A 8 right and 7 down to B; then a second arrow goes from B 8 left and 7 up back to A. Both slides are written beside the grid.
See the whole ideathe big idea and the key word, in one place
The big idea
To undo a slide, keep both numbers and flip both directions.
There and back
There and back again lands exactly where it began.
- A(3, 12)
- 8 right, 7 down(11, 5)
- 8 left, 7 up(3, 12)
Key word
- reverse
- the opposite move, the one that undoes the first
Ready to use it?
- Find the slide that undoes another slide.