How do you solve: 3x-1/6<2?
How do you solve 3x negative 1 over 6 is less than or equal to 2
回答 (9)
✔ 最佳答案
3x-(1/6)<=2
3x<=13/6
x<=(13/6)/(3)
Ok, if it's (3x - 1)/6 <= 2, here's your answer
Multiplying the whole expression by 6
3x - 1 <= 12
Add 1 to both sides of the expression
3x <= 11
Divide the whole thing by 3
x <= 11/3 <<<< answer.
Now, if it's 3x - 1/6 <= 2
Add 1/6 to both sides:
3x <= 13/6
Divide all by 3
x <= 13/18 <<< Answer.
Good luck! :)
I guess what u mean is (3x -1)/6 < or = 2
(3x -1) <= 2(6) multiply both sides by the multiplicative inverse of 1/6
3x -1 <= 12
3x -1 + 1<=12 +1 by addition property
3x <=13
(3x)(1/3) <= 13(1/3) multiplication property, multiplying both sides by the multiplicative inverse of 3
x <= 13/3
參考: solving inequality topic from any algebra books
(3x - 1)/6 <= 2
3x - 1 <= 12
3x <= 13
x <= 13/3
The steps are the same as for solving an equality, except for one catch:
If you multiply (or divide) both sides by a negative number, the inequality flips direction.
Example:
3 < 5 (three is smaller than 5)
multiply by -1 on both sides:
-3 > -5 (minus 3 is greater than -5)
the direction of the inequality "flipped" because we multiplied by a negative number.
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Let's say you started with 3x - (1/6) < 2
add (1/6) to both sides
3x - (1/6) + (1/6) < 2 + (1/6)
3x < 13/6
divide both sides by +3 (when multiplying and dividing, it is good to show the sign, in order to avoid confusion)
Dividing by a positive number: the inequality does not flip.
3x / 3 < (13/6) / 3
x < 13/18
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You can do the same type of approach with
(3x-1)/6 < 2
first step, multiply both sides by +6 (positive: the inequality does not flip)
---
The rule about flipping the inequality only applies to multiplication or division, it does not apply for addition or subtraction.
If you are not certain, do a little test on the side:
-3 > -5
subtract 7 from both sides
-3 - 7 > -5 - 7
-10 > -12
still true; subtracting 7 did not flip the inequality
3x - 1/6 ⤠2
3x ⤠2 + 1/6
3x ⤠12/6 + 1/6
3x ⤠13/6
x ⤠(13/6)/3
x ⤠(13/6)(1/3)
x ⤠13/18
3x - 1/6 <= 2
Add 1/6 to both sides
3x - 1/6 + 1/6 <= 2 + 1/6
3x + 0 <= 12/6 + 1/6
3x <= 13/6
Divide both sides by 3
3x / 3 <= (13/6) / 3
x <= (13/6) / 3
x <= 13/18
:)
3x -(1/6) LTE 2 (LTE means 'less than or eqaul to')
3x LTE 2 + 1/6
3x LTE 12/6+1/6
3x LTE 13/6 (now divide by 3 to islate x)
x LTE 13/6 times 1/3
x LTE 13/18
收錄日期: 2021-05-01 11:54:32
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