ShmoopTube
Where Monty Python meets your 10th grade teacher.
Search Thousands of Shmoop Videos
ACT Math Videos 164 videos
ACT Math: Trigonometry Drill 1, Problem 1. What is the length of y?
ACT Math: Coordinate Geometry Drill 1, Problem 2. Solve the inequality and determine which solution is shown on the number line.
ACT Math 2.1 Pre-Algebra 380 Views
Share It!
Description:
ACT Math: Pre-Algebra Drill 2, Problem 1. Solve for x in this equation.
Transcript
- 00:03
Here's your Shmoop du jour...
- 00:05
Solve for X.
- 00:06
3x plus seven X plus nine equals 35 and here are the potential answers:
- 00:14
Okay, so what is this problem asking us to do?
- 00:16
Well, it's really just a straightforward "Solve for X" dance.
Full Transcript
- 00:19
We just combine terms to simplify and we're there...
- 00:23
...wherever there is....but okay we have 3x, 7x which we can add
- 00:27
to get 10x. We can subtract 9 from both sides
- 00:31
35 -9 is 26, so we have 10x equals 26.
- 00:36
Now divide both sides by 10
- 00:38
and X equals 26 over 10. Done.
- 00:42
Wait...not done...there's no 26 over 10 in the answers.
- 00:46
What did we do wrong? Well, we need to reduce.
- 00:49
10 and 26 are even numbers
- 00:51
so if nothing else we can divide 2 into each of them evenly
- 00:54
and getting now reduced 13 over 5 which ta-da
- 00:58
is here. Answer C.
Related Videos
ACT Math: Plane Geometry Drill 3, Problem 1. What is the area of the trapezoid shape in the video?
ACT Math: Coordinate Geometry Drill 1, Problem 1. Which inequality is expressed by the number line?
ACT Math: Intermediate Algebra: Drill 3, Problem 1. Find the fifth number in the series.
It's impressive that these expressions are able to stay so rational even when they're having operations performed on them.
Jack and Jill went up the hill to fetch a pail of water. But what happened when they got up there? They’ve been gone an awfully long time…