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ACT Math Videos 161 videos
ACT Math: Plane Geometry Drill 3, Problem 1. What is the area of the trapezoid shape in the video?
ACT Math Pre-Algebra Drill 2, Problem 5. Given the chart in the video, what is the mode?
ACT Math 3.4 Intermediate Algebra 641 Views
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Description:
ACT Math: Intermediate Algebra Drill 3, Problem 4. Solve this system.
Transcript
- 00:03
To Shmoop or not to Shmoop...
- 00:05
That is not this question. That's not even the section. This is math...
- 00:08
...come on now. Alright solve this system 4x -3 y equals 12
- 00:13
X equal three-plus three fourths y
- 00:17
And here are the potential answers...
Full Transcript
- 00:20
Okay, so what is this question asking?
- 00:22
Well, it's another substitution problem like Equal
- 00:25
and Nutrasweet, but this one is a total trick question.
- 00:29
If we multiply the bottom equation by four...
- 00:38
...we get 4x equals twelve plus three y.
- 00:43
Subtract 3y from both sides and uh...look familiar?
- 00:47
Yeah they are totally the same equation twinsies.
- 00:50
So what does that mean? Well let's think about it. Whenever asked to find a
- 00:55
solution of two equations
- 00:57
we're really trying to find the point of intersection of the two lines
- 01:00
- 01:03
if the two given lines are exactly the same which they are in this case
- 01:08
that means they intersect each other everywhere
- 01:11
or at all real numbers. So the correct answer is D.
- 01:14
Too bad Mr. Smith would have given us a gold star. Sniff sniff.
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