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In geometry, points are called collinear if they all lie on the same line. What, no bunk beds?
SAT Math 5.1 Numbers and Operations 274 Views
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Description:
SAT Math 5.1 Numbers and Operations
Transcript
- 00:02
Here’s your shmoop du jour, brought to you by Line Segments.
- 00:05
For when you’re not hungry enough to eat an entire line.
- 00:09
The midpoint of AB is (1.5, 3). If A is (-0.5, 2), what is the x-coordinate of B?
- 00:21
Okay, so we’re asked to find the x-coordinate of the point that will create a line segment
- 00:26
whose midpoint is 1.5, 3.
Full Transcript
- 00:29
All right… first, it helps to graph out the information we do have.
- 00:34
Since we’re just concerned with finding the x-coordinate, we only need to focus on
- 00:38
the x-coordinates of the problem.
- 00:40
To go from the x-coordinate of point A to the x-coordinate of the midpoint,
- 00:45
we need to hop over 2 units to the right.
- 00:48
Since it's the MIDPOINT, we know point B must have an
- 00:51
x-coordinate another 2 units to the right of the midpoint.
- 00:56
We have 1.5 plus 2 is 3.5...
- 01:00
That's it. That's our answer. 3.5.
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