ShmoopTube

Where Monty Python meets your 10th grade teacher.

Search Thousands of Shmoop Videos


Geometry Videos 251 videos

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...

Introduction to 3D Geometry
55503 Views

It's one thing when all those shapes are sitting flat on the page. But when they start popping out and invading our personal space bubble, we get a...

See All

ACT Math 4.1 Coordinate Geometry 238 Views


Share It!


Description:

ACT Math: Coordinate Geometry Drill 4, Problem 1. Find the equation of the line described.

Language:
English Language

Transcript

00:02

For a good time, solve this shmoopy question...

00:05

What is the equation of a line perpendicular to Y equals

00:09

negative 1/2 X plus four and containing the point 8, 2?

00:14

And here are your options...

00:16

Okay, so this question is testing whether we know that in

00:20

the land of Y equals MX plus B

00:23

were M is the slope of a line. The slope of a line

00:26

perpendicular to that line is the negative

00:29

inverse of that form. In this example the slope is negative 1/2

00:35

so we just need that negative reciprocal so that'll be positive

00:39

2 over one or just positive 2. So we can get rid of B and C as potential answers.

00:44

We also know that one point this perpendicular line contains is

00:49

8 , 2. So all we need to do is plug in these points

00:54

into Y equals MX plus B so

00:57

we get 2 equals 2 times

01:00

8 plus B and we have 2 equals 16 plus B

01:04

or B equals -14 and we have Y equals 2x -14

01:09

there you go. The answer is E.

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 Intermediate Algebra
1955 Views

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

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?

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...