-3x+9=15x-9
2006-10-16 02:48:05 · 16 answers · asked by ttt 1 in Science & Mathematics ➔ Mathematics
- 3y + 9 = 15x - 9
-3y + 9 + 3x = 15x - 9 + 3x
9 = 18 x - 9
9 + 9 = 18x - 9 + 9
18 = 18x
18/18 = 18x/18
1 = x
The answer is x = 1
The solution set is { 1 }
Insert the x value into the equation
- - - - - - - - - - - - - - - - - - - - - - - - s
Check
- 3x + 9 = 15x - 9
- 3(1) + 9 = 15(1) - 9
-3 + 9 = 15 - 9
6 = 6
- - - - - - - - - - - -s
2006-10-16 03:33:35 · answer #1 · answered by SAMUEL D 7 · 1⤊ 0⤋
-3x + 9 = 15x - 9
9 = 15x - 9 + 3x
9 = 18x - 9
9 + 9 = 18x
18 = 18x
18/18 = x
1 = x
x is 1
2006-10-16 15:20:10 · answer #2 · answered by Jen 2 · 0⤊ 0⤋
You need to isolate the x. First you want to move the numbers with no variable from one side of the equation to the other. In this case the 9. Add 9 to the second equation to get zero. Then add that 9 to the first equation.
-3x+9=15x-9
+9 +9
Now you have:
-3x+18=15x
Next you want to add 3x to both equations so that the x is on one side and the lone number is on the other.
-3x+18=15x
+3x +3x=
18=18x
Now you have to completely isolate the x by dividing both sides by 18 which leaves you with:
x=1
2006-10-16 10:05:45 · answer #3 · answered by scheerbarbara 1 · 0⤊ 0⤋
LHS RHS
-3x+9 15x-9
add 3x and 9 on both sides of the equation
result will be
18=18x
therefore x=1 Ans
2006-10-16 09:59:13 · answer #4 · answered by Twarita 2 · 0⤊ 0⤋
-3X+9 =15X-9
=>18X=18
=>X=1
2006-10-16 09:56:15 · answer #5 · answered by purushotham s 1 · 0⤊ 0⤋
-3x+9=15x-9 add 3x to each side
9=15x+3x-9=18x-9 add 9 to each side
18=18x divide each side by 18
x=1
2006-10-16 11:21:13 · answer #6 · answered by yupchagee 7 · 0⤊ 0⤋
-3x+9=15x-9
Taking x terms to the right and the constants to the left
we have
9+9=15x+3x
18=18x
x=18/18
x=1
2006-10-16 09:53:42 · answer #7 · answered by Kartik 1 · 0⤊ 0⤋
easy add +3x to both sides you'll have -3x+3x+9=15x-9+3x
9=18x-9 add 9 to both 18=18x x=1
2006-10-16 09:54:06 · answer #8 · answered by ??? 2 · 0⤊ 0⤋
-(-3x +9) +15x -9 = 0
3x -18 +15x =0
18x = 18
x = 1
2006-10-16 10:11:02 · answer #9 · answered by nanduri p 2 · 0⤊ 0⤋
"-3x+9=15x-9"
You need to combine like terms so subtract "-3x" from both sides (likewise, adding "3x" to both sides).
-3x+9=15x-9
+3x------+3x
9=18x-9
Then you need to subtract "-9" from both sides (likewise, adding "9" to both sides)
9=18x-9
+9----+9
18=18x
Then find the value of "x" by dividing each side by "18"
So x=1
Hope that helps.
You're welcome in advance.
2006-10-16 10:22:23 · answer #10 · answered by ViCKi!™|` 5 · 0⤊ 0⤋