how do you do that with working out
2006-10-07 08:43:01 · 13 answers · asked by mojo jojo 1 in Education & Reference ➔ Homework Help
7x + 2 + 3x + 9 = 7X + 20
10x + 11 = 7x +20
10x = 7x + 31
17x = 31
x = 31 / 17
2006-10-07 08:47:11 · answer #1 · answered by John 3 · 0⤊ 2⤋
7x+2+3x+9=7x+20 ---which equals(next line)
7x+3x + 2+9 = 7x+20 ---simplify the equation(next line)
10x + 11 =7x+20 ---subtract 7x from both sides(etc...)
10x -7x + 11 =7x-7x +20 ---simplify the equation
3x + 11 =20 ---subtract 11 from both sides
3x + 11-11 =20-11 ---simplify the equation
3x = 9 ---Divide both sides by three
3x /3 = 9/3 ---(where / is the sign for divide) simplify
x=3 check answer 21+2+9+9=21+20
23 +18 =41
41=41 YES!
2006-10-07 08:57:03 · answer #2 · answered by csar3742 2 · 0⤊ 0⤋
1) combine the like terms on the left side of the equation.
7x + 3x = 10x
and
2 + 9 = 11
so now you have 10x + 11 = 7x + 20 as your new equation
2) to get x by itself subtract 7x from each side.
you end up with
3x + 11 = 20
3) To get 3x by itself subtract 11 from each side.
4) You end up with 3x = 9
5) Divide 3 from each side to have x by itself. The final answer is x = 3
so here's the problem without the writing
7x+2+3x+9=7x+20
10x + 11 = 7x + 20
-7x -7x
3x + 11 = 20
-11 -11
3x = 9
x = 9
2006-10-07 08:53:21 · answer #3 · answered by Anonymous · 0⤊ 0⤋
Take away 7x from both sides.
2+9+3x=20
Add 2 and 9 + 11, and take away from 20.
That leaves 3x=9, so x is 3.
Think of it as a balancing sum.
2006-10-07 08:45:18 · answer #4 · answered by Heyhey 2 · 1⤊ 0⤋
First add like terms on each side
10x+11=7x+20
Subtract 11 from both sides
10x=7x+9
Subtract 7x from both sides
3x=9
Divide both sides by 3
x=3
2006-10-07 08:53:01 · answer #5 · answered by Anonymous · 0⤊ 0⤋
Put all the numbers with "x" on one side... and all the integers on the other...
7x+3x-7x=20-2-9 then do the math..... 3x=9 x=3
2006-10-07 08:45:47 · answer #6 · answered by Mike B 2 · 1⤊ 0⤋
Combine like terms: 10x + 11 = 7x + 20
Subtract from both sides:-11 - 11
You are left with: 10x = 7x + 9
Subtract: -7x -7x
You are left with: 3x=9
Divide 3 on both sides and get x = 3
2006-10-07 08:59:24 · answer #7 · answered by BUDDY LUV 3 · 0⤊ 0⤋
7x +3x+2+9= 7x + 20
20x + 11 =7x +20
10x -7x =20 - 11
3x = 9
x = 9/3
= 3
2006-10-07 08:51:21 · answer #8 · answered by Anonymous · 0⤊ 0⤋
x=3
2006-10-07 08:48:47 · answer #9 · answered by ♥blah♥ 3 · 0⤊ 0⤋
ok add the 7x and 3x you'll get 10 and add the 2 and 9 and you'll get 11 so it will look like this
10x+11 = 7x+20
move the 7x to the other side and move the 11 to the other side so
10x-7x = 20-11
3x = 9
divide 3
x = 9 ta da!!
whoever gave me thumbs down is an asshole!
2006-10-07 08:47:46 · answer #10 · answered by ♥Meow♥ 5 · 0⤊ 1⤋