ShmoopTube

Where Monty Python meets your 10th grade teacher.

Search Thousands of Shmoop Videos


Coordinate Geometry Videos 26 videos

Inequalities in Number Lines
3229 Views

ACT Math: Coordinate Geometry Drill 1, Problem 1. Which inequality is expressed by the number line?

Parallel Lines
257 Views

ACT Math: Coordinate Geometry Drill 3, Problem 5. What is the slope of a line parallel to one with the given equation?

ACT Math 1.2 Coordinate Geometry
252 Views

ACT Math: Coordinate Geometry Drill 1, Problem 2. Solve the inequality and determine which solution is shown on the number line.

See All

ACT Math 4.5 Coordinate Geometry 200 Views


Share It!


Description:

ACT Math: Coordinate Geometry Drill 4, Problem 5. What is the equation of the graph in the video?

Language:
English Language

Transcript

00:02

Here's your shmoop du jour, brought to you by Line Equations. Whose Line Equation is

00:07

it anyway? What is the equation of this graph?

00:11

And here are your potential answers...

00:17

This graph shows us the two points of intersection; they are here at point 5 on the x-axis...

00:22

and here at 2 on the y axis. So right off the bat, we know that 2 points

00:27

on the line are .5, 0 and 0, 2. And since the line slopes downward, we know

00:34

its slope will be negative.

00:36

Now back to our old friend y equals mx plus

00:38

b, the standard form of a line. We can get the slope m by doing the

00:43

y over x dance like this...

00:45

and we get y2 minus y1 over x2 minus x1...

00:48

...or 2 minus 0 over 0 minus .5... ...which equals negative 2 divided by a half

00:54

or... negative 4. So we have y equals negative 4 times x plus

00:58

b...and we can just plug in some points to get b. Let's try the 2nd point - zero, 2

01:05

We have 2 equals negative 4 times 0 plus b or... 2 equals... b.

01:10

Which is answer C.

Related Videos

Inequalities in Number Lines
3229 Views

ACT Math: Coordinate Geometry Drill 1, Problem 1. Which inequality is expressed by the number line?

ACT Math 3.1 Plane Geometry
2559 Views

ACT Math: Plane Geometry Drill 3, Problem 1. What is the area of the trapezoid shape in the video?

ACT Math 3.1 Intermediate Algebra
1955 Views

ACT Math: Intermediate Algebra: Drill 3, Problem 1. Find the fifth number in the series.

Surface Area of Cylinders
14741 Views

Haven't you always wondered how much cardboard it takes to encase a trunk warmer for your pet elephant?

Perimeter of Irregular Shapes
4864 Views

Want to figure out the area and perimeter of irregular shapes? Break them down into regular shapes. For example, a flower can be broken down into s...