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Coordinate Geometry Videos 38 videos
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...
Coordinate geometry isn't your average geometry. Check out the video to find out why.
Standard Form Equations 256 Views
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Description:
ACT Math: Coordinate Geometry Drill 3, Problem 3. What is the standard form equation for the line?
- Coordinate Geometry / Slope
- Coordinate Geometry / Graphs of points, lines, polynomials, and circles
- Product Type / ACT Math
- Foreign Language / Korean Subtitled
- Foreign Language / Spanish Subtitled
- Foreign Language / Chinese Subtitled
- Foreign Language / Arabic Subtitled
- Coordinate Geometry / The relations between equations and graphs
Transcript
- 00:02
For a good time, solve this shmoopy question...
- 00:05
What is the standard form of a line through 3/4, one with M equals -1/2?
- 00:12
Here are your options...
- 00:15
Okay, so this question is asking us to apply the Y equals MX plus B format
- 00:20
but to plug in a point. So here we are given M
Full Transcript
- 00:23
and its -1/2. Already we can fill in the equation to be Y equals -1/2 X plus B.
- 00:30
Well the question gives us one point the line is going to intersect
- 00:34
and we know that the slope is gonna be gently negatively sloping
- 00:38
at minus a half. So rewrite the equation to be one equals -1/2
- 00:43
times 3/4 plus B. Then just solve and we have one
- 00:48
equals -3/8 plus B. Add 3/8 to both sides
- 00:53
and we have 1 3/8 equals B. Glance at the potential answers and we see that there
- 00:59
is no 1 3/8, but there is an 11/8.
- 01:02
So that's the form they want this thing in and now we can write the equation as
- 01:06
Y equals -1/2 X plus 11/8 and the answer is D.
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