x-3x+9=27
55-3x-2x=10
61=6-8x-3x
2006-07-26 05:12:22 · 6 answers · asked by Anonymous in Education & Reference ➔ Home Schooling
x = -9
x = 9
x = 5
2006-07-26 05:16:28 · answer #1 · answered by quikboy 7 · 0⤊ 0⤋
You move the 9 to the right side, so that you have all the (x's) on one side.
x - 3x = -9 + 27
So just fix it up so that it looks easier.
x - 3x = -2x
and -9 +27 = 18
It is the same as 27 -9.
So the equation is simplifies as:
-2x = 18
Now divide both sides by -2 so that you get the value of x:
x = -9
That 's because 18 / -2 = -9
Now for the 2nd equation:
55 - 3x - 2x = 10
Move the (x's) to one side and the numbers to the other:
55 - 10 = 3x + 2x
Do the calculating:
45 = 5x
Divide both sides by 5:
x = 9
The Last equation:
61 = 6 -8x -3x
Move the (x's) to one side and the numbers to one side:
61 -6 = -8x -3x
Calculate:
55 = -11x
Divide both sides by -11:
x = 55 / -11
x = -5
Hope that helped!
2006-07-26 16:00:15 · answer #2 · answered by EHRS 1 · 0⤊ 0⤋
Instead of just giving you the answers, it would be best for you to know how to figure it out yourself. (Btw, I hope you're not doing this to cheat on something!)
For all of your equations listed, there are 3 steps:
1) Simplify all the x's. So x-3x+9 becomes -2x+9. And so on.
2) Remove the constant (otherwise know as the friend who keeps trying to hang around; the goal in all of these equations is to have x by his lonesome). So, in your first equation, to remove the constant from the left side, you need to subtract by 9; because the two sides have to remain equal, you need to subtract 9 from the other side, too.
3) Remove the coefficient (the co-dependent guy glued to the variable, x.) You need to divide each side by the coefficient. So, for your first equation, which has become -2x=18, divide each side by -2. You will then have the value of x.
There you go! Follow those steps and you can do any similar equation.
2006-07-26 14:28:46 · answer #3 · answered by glurpy 7 · 0⤊ 0⤋
1)
x-3x+9 = 27
-2x+9 = 27
-9 = -9
-2x = 18
-2x = -2x
x = -9
I hope i did it right :P, i'm not good in math though, so i am not really sure if it's correct!
2006-07-26 12:25:02 · answer #4 · answered by Lesley 3 · 0⤊ 0⤋
x=-9
x=9
x=-5.
You know, thought that these are very simple algebra. I would kindly suggest that you need help homeschooling for math if you can't do these, unless the homeschool child is quite young.
Hope this helps.
John Steele
2006-07-26 12:21:08 · answer #5 · answered by papa.john 1 · 0⤊ 0⤋
are you missing some exponents? if not
1. -2x = 18
x = -9
2. -5x = - 45
x=9
3. 55 = -11x
x = -5
2006-07-26 12:17:29 · answer #6 · answered by BigD 6 · 0⤊ 0⤋