Solve the following equations for X.?
2008-11-16 1:54 pm
I have loads of these to do (aswell as other ones, see link) so if you could just show me how to do that first one I can figure out the rest.
2x+3=x+9
Thanks.
http://uk.answers.yahoo.com/question/index?qid=20081116055318AAOK1xQ
回答 (10)
2008-11-16 1:58 pm
✔ 最佳答案
2x + 3 = x + 9-x from both sides
x + 3 = 9
- 3 from both sides
x = 6
2008-11-16 2:00 pm
its a balancing equation
to find the value of x you have to see how much is the difference
3 is a 3rd of 9, so the value for x is going to be 6
2x 6 + 3 is 15
6+ 9 is 15
to find the value of x you have to see how much is the difference
3 is a 3rd of 9, so the value for x is going to be 6
2x 6 + 3 is 15
6+ 9 is 15
2008-11-17 7:45 am
2x - x = 9 - 3
x = 6
x = 6
2008-11-16 2:45 pm
Transpose the terms containing the variable (i.e., x) to the left hand side and the constant terms 3 and 9 to the right.
2x-x = 9-3
x=6
2x-x = 9-3
x=6
2008-11-16 2:29 pm
2x + 3 = x + 9
2x - x = -3 + 9
x = 6
2x - x = -3 + 9
x = 6
2008-11-16 2:15 pm
The logical way is to move the Xs to one side and the numbers to the other. That is what all the examples are doing.
When you move a value from one side to the other you need to change its sign, that means + becomes - and - becomes +.
2x -x = x
and 9-3 =6
as there is only one x the answer is x = 6.
For the equation 3x -3 = x + 9
3x -x = 2x
9+3 = 12
therefore 2x = 12
and x = [12 divide by 2] 6
When you move a value from one side to the other you need to change its sign, that means + becomes - and - becomes +.
2x -x = x
and 9-3 =6
as there is only one x the answer is x = 6.
For the equation 3x -3 = x + 9
3x -x = 2x
9+3 = 12
therefore 2x = 12
and x = [12 divide by 2] 6
2008-11-16 2:11 pm
Just collect all the x's on the left side and all the numerical values on the right. Then divide across by the x coefficient. Remember that when you move a quantity from one side to the other, its sign changes. Some people describe this as subtracting x from both sides and 3 from both sides - same difference. In your example.......
2x + 3 = x + 9
2x - x = 9 - 3
x = 6
Another example:
6y + 15 = 3y - 3
6y - 3y = -3 -15
3y = -18
y = - 6
OK?
2x + 3 = x + 9
2x - x = 9 - 3
x = 6
Another example:
6y + 15 = 3y - 3
6y - 3y = -3 -15
3y = -18
y = - 6
OK?
2008-11-16 2:00 pm
ill try and type this as best i can
2x+3=x+9
take "x" from both sides
2x+3-x=x+9-x
1x+3=9
take 3 from both side
1x+3-3=9-3
1x=6
2x+3=x+9
take "x" from both sides
2x+3-x=x+9-x
1x+3=9
take 3 from both side
1x+3-3=9-3
1x=6
2008-11-16 1:58 pm
2x= x + 6
= 2x - x = 6
x = 6
= 2x - x = 6
x = 6
收錄日期: 2021-05-01 11:32:07
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20081116055441AA95UAu