Lesson · Grade 7 · Mathematics
Distance Between Two Points on a Grid Line
- Grade 7
- Mathematics
- 58 s
- British Columbia
- BC7-MA-58
The points A(−3, 2) and B(4, 2) have the same y-coordinate, so they sit on the same horizontal grid line and only x changes between them. Counting along the line gives 7 units, and splitting the gap at the y-axis checks it (3 + 4 = 7), so A and B are 7 units apart.
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In one sentence
The question this lesson answers
How far is the point A at negative 3, 2 from the point B at 4, 2?
First, plot both points on the grid.
Transcript
What the lesson says
How far is the point A at negative 3, 2 from the point B at 4, 2?
First, plot both points on the grid.
Both points have the same y-coordinate, 2.
So they sit on the same horizontal grid line.
Only the x-coordinate changes, from negative 3 to 4.
Count the units along the line from A to B.
That makes 7 units.
A quicker way is to split the gap at the y-axis.
A is 3 units to the left of the y-axis.
B is 4 units to the right of it.
Add the two parts. 3 plus 4 is 7.
So the distance from A to B is 7 units.
On a grid line, the distance is the number of units between the coordinates that change.
Curriculum
Where this fits
- British Columbia, Grade 7
Mathematics, Geometry and measurement: Cartesian coordinates and graphingBC7-MA-58
Previous: Reading the coordinates of a pointNext: Translations: Slide Every Point the Same Way
The outcomes and strands follow the British Columbia curriculum.
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