How to solve linear equations
Lesson 11 of 20 in Union Aptitude Prep. The start plays free here.
- A variable represents the unknown
- Find a value for the variable
- Check it in the original equation
- 3x + 6 = 18
- 3x = 12
- x = 4
- Check: 3(4) + 6 = 18
- T = a + b
- a = T − b
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How the lesson starts
You need to find a quantity you do not know yet. You can choose a variable, such as a letter, to represent that unknown quantity.
You see 3x + 6 = 18 in a practice problem. Your target is x by itself on one side of the equals sign.
Then, in the full lesson
- Remove six
- Isolate x
- Check the original
- A formula
- Same target
- 2 questions along the way
A question from this lesson
You need to solve 2x + 5 = 11. Which value makes the equation true?
- x = 8
- x = 3
- x = 6
Show the answer
B. x = 3. x = 3 works because 2(3) + 5 = 11. Using 8 gives 21, not 11. Using 6 gives 17, not 11; subtracting 5 alone does not isolate x.
The full class, $39 once.
Paid once, no subscription. Ask for a refund within 7 days of buying if you’ve done less than 25% of the class.
- Number series trainer
- Algebra & functions with worked steps
- Reading comprehension sets
Not affiliated with IBEW, NECA, ETA or any JATC. Original practice questions only.