Hiya, I'm doing this maths test and I have ALWAYS had so much trouble with equations (Algebra in general, really), and I'm hoping someone can help me with these?:
4x - 7 = 11
x = ___
and
24 + x = 3x + 2
x = ___
Please give me a detailed answer taking me through each step of working these out. Thanks. :]
Please help me with equations? (10pts)?
2009-01-06 2:37 pm
回答 (12)
2009-01-06 2:40 pm
✔ 最佳答案
4x - 7 = 114x=7+11
4x=18
x=18/4
x=4.5
24 + x = 3x + 2
24-2=3x-x
22=2x
x=22/2
x=11
4.5 and 11
2009-01-06 10:57 pm
4x-7=11
4x=11+7
4x=18
x=18/4 or 9/2 answer
24+x=3x+2
x-3x=2-24
-2x=-22
x=11 answer @(^_^)@
4x=11+7
4x=18
x=18/4 or 9/2 answer
24+x=3x+2
x-3x=2-24
-2x=-22
x=11 answer @(^_^)@
2009-01-06 10:55 pm
1)
4x - 7 = 11
4x = 11 + 7
4x = 18
x = 18/4
x = 9/2 (4.5)
2)
24 + x = 3x + 2
-3x + x = -24 + 2
-2x = -22
x = -22/-2
x = 11
4x - 7 = 11
4x = 11 + 7
4x = 18
x = 18/4
x = 9/2 (4.5)
2)
24 + x = 3x + 2
-3x + x = -24 + 2
-2x = -22
x = -22/-2
x = 11
2009-01-06 10:47 pm
4x - 7 = 11
add 7 to both sides
4x - 7+7 = 11+7
4x=18
Divide both sides by 4
4x/4=18/4
x=4.5
you can check
4*4.5 - 7 =11
For the second one
24 + x = 3x + 2
subract x from both sides
24 + x-x = 3x + 2 -x
24= 2x + 2
subtract 2 from both sides
24-2= 2x + 2 -2
22 = 2x
divide both sides by 2
22/2 = 2x/2
11=x
and check
24+11 = 3*11 +2
35= 35
add 7 to both sides
4x - 7+7 = 11+7
4x=18
Divide both sides by 4
4x/4=18/4
x=4.5
you can check
4*4.5 - 7 =11
For the second one
24 + x = 3x + 2
subract x from both sides
24 + x-x = 3x + 2 -x
24= 2x + 2
subtract 2 from both sides
24-2= 2x + 2 -2
22 = 2x
divide both sides by 2
22/2 = 2x/2
11=x
and check
24+11 = 3*11 +2
35= 35
2009-01-06 10:46 pm
4x -7 = 11
+7 +7
4x = 18
x=18/4=9/2
On this one, you start by adding 7 to both sides, then you can divide by 4 to get the final answer of 9/2.
24 + x = 3x + 2
-2 - x = -x - 2
22 = 2x
x = 11
On this one, you subtract x from both sides and subtract 2 from both sides to get the x term on one side and the constant on the other side. Then you divide by two to get the final answer of 11.
+7 +7
4x = 18
x=18/4=9/2
On this one, you start by adding 7 to both sides, then you can divide by 4 to get the final answer of 9/2.
24 + x = 3x + 2
-2 - x = -x - 2
22 = 2x
x = 11
On this one, you subtract x from both sides and subtract 2 from both sides to get the x term on one side and the constant on the other side. Then you divide by two to get the final answer of 11.
2009-01-06 10:45 pm
4x - 7 = 11
Add 7 to both sides:
4x - 7 + 7 = 11 + 7
4x = 18
Divide EVERYTHING on both sides by 4:
(4x) / 4 = (18) / 4
x = 4.5
24 + x = 3x + 2
Subtract x from both sides:
24 + x - x = 3x + 2 - x
24 = 2x + 2
Subtract 2 from both sides:
24 - 2 = 2x + 2 - 2
22 = 2x
Divide everything on both sides by 2:
(2x) / 2 = (22) / 2
x = 11
Here's a shortcut: If you have
x - 3 = 15
Instead of adding 3 to both sides, move the (-3) over to the other side and change the sign.
x = 15 + 3 = 18
Add 7 to both sides:
4x - 7 + 7 = 11 + 7
4x = 18
Divide EVERYTHING on both sides by 4:
(4x) / 4 = (18) / 4
x = 4.5
24 + x = 3x + 2
Subtract x from both sides:
24 + x - x = 3x + 2 - x
24 = 2x + 2
Subtract 2 from both sides:
24 - 2 = 2x + 2 - 2
22 = 2x
Divide everything on both sides by 2:
(2x) / 2 = (22) / 2
x = 11
Here's a shortcut: If you have
x - 3 = 15
Instead of adding 3 to both sides, move the (-3) over to the other side and change the sign.
x = 15 + 3 = 18
2009-01-06 10:44 pm
4x=11+7
4x=18
4x/4=18/4
x=4.5
24=3x-x+2
24-2=2x
22=2x
x=11
4x=18
4x/4=18/4
x=4.5
24=3x-x+2
24-2=2x
22=2x
x=11
2009-01-06 10:43 pm
4x - 7 = 11
4x = 11 + 7
4x = 18
x= 18/4
x = 4.5
24 + x = 3x + 2
24 -2 + x = 3x
22 + x = 3x
22 = 3x -x
22 = 2x
22/2 = x
11 = x
4x = 11 + 7
4x = 18
x= 18/4
x = 4.5
24 + x = 3x + 2
24 -2 + x = 3x
22 + x = 3x
22 = 3x -x
22 = 2x
22/2 = x
11 = x
2009-01-06 10:43 pm
4x=11+7
4x=18
x=18/4
x=4.5
3x-x=24-2
2x=22
x=22/2
x=11
good luck with the exam.
4x=18
x=18/4
x=4.5
3x-x=24-2
2x=22
x=22/2
x=11
good luck with the exam.
2009-01-06 10:41 pm
i would have helped u but we haven't started doing extreme algebra yet
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