ShmoopTube
Where Monty Python meets your 10th grade teacher.
Search Thousands of Shmoop Videos
Coordinates and Graphs Videos 64 videos
The video will show you how to plot points in 3D using the axes of the 3D coordinate system. Make sure you're wearing your special glasses for this...
When graphing inequalities, you graph the line, shade the corresponding side, and plug in the point. The end!
One formula to rule them all, one formula to find them. One formula to bring them all, and in the darkness bind them. Or something like that. I...
CAHSEE Math 3.5 Algebra I 205 Views
Share It!
Description:
Algebra I Drill 3 Problem 5. What is the y -intercept point of the line?
Transcript
- 00:03
This is how we shmoop it… we shmoop it…
- 00:07
The point (4, 6) lies on a line that has a slope of 2.
- 00:11
What is the y-intercept point of the line?
- 00:14
And here are the potential answers…
- 00:19
So… what is this question asking?
Full Transcript
- 00:21
Can we… divine the line?
- 00:23
We start as always with our friend, y equals mx plus b…
- 00:27
and we just fill in whatever numbers we know.
- 00:29
The problem gives us m… it’s 2.
- 00:32
Let’s rewrite the slope to be y = 2x + b
- 00:36
Now we need to find b.
- 00:38
Let’s just plug in the x and y figures that the kind, loving people from ProblemLand have given us:
- 00:44
Rewrite this to be:
- 00:45
6 = 2 times 4 plus b
- 00:49
…or 6 equals 8 plus b.
- 00:51
So b is… negative 2.
- 00:53
Rewrite again as:
- 00:54
y = 2x minus 2
- 00:57
The only answer that works is B, where x is 0 and 2 times 0 is 0 so … we’re done.
- 01:03
Our answer is B.
- 01:04
As in, “Us and y = mx+b. Best buds.”
Related Videos
CAHSEE Math: Algebra and Functions Drill 5, Problem 3. Solve the equation.
How do you solve a system of linear inequalities? Aw, man...and we thought solving a problem like Maria was tough...
Please note: If starting your own petting zoo, Shmoop recommends you stock it with animals that aren’t quite so likely to bite your hand off. Tha...
Solving systems of equations by elimination: Survivor-style. Sorry, y... the tribe as spoken.