Solve for x?

2008-06-27 2:08 pm
45) Solve for “n”: 3(n – 1) = 2n + 8



46) Solve for “y”: 4y + 3(y + 3) = 14y + 23

回答 (13)

2008-06-27 2:16 pm
✔ 最佳答案
3(n – 1) = 2n + 8
3n - 3 = 2n + 8
3n - 2n = 8 + 3
n = 11

4y + 3(y + 3) = 14y + 23
4y + 3y + 9 = 14y + 23
7y - 14y = 23 - 9
-7y = 14
-y = 14/2
-y = 7
y = 7 x (1)
y = -7
2008-06-27 9:17 pm
3n-3=2n+8
=> n=11

4y+3y+9=14y+23
=> 7y= (-14)
=> y=(-2)
2008-06-28 10:29 pm
I`m searching everywhere for an x !!!!

Question 45)
3n - 3 = 2n + 8
n = 11

Question 46)
4y + 3y + 9 = 14y + 23
- 14 = 7y
y = - 2
2008-06-27 9:21 pm
45)
3(n - 1) = 2n + 8
3*n - 3*1 = 2n + 8
3n - 3 = 2n + 8
3n - 2n = 3 + 8
n = 11

46)
4y + 3(y + 3) = 14y + 23
4y + 3*y + 3*3 = 14y + 23
4y + 3y + 9 = 14y + 23
7y - 14y = -9 + 23
-7y = 14
y = 14/-7
y = -2
2008-06-27 9:16 pm
first distribute
3n-3=2n + 8
n=11

2. 4y+3y+9=14y+23
7y+9=14y+23
-7y=14
y=-2
2008-06-27 9:16 pm
45. 3(n-1) = 2n +8
3n-3 =2n+8
-3-8 = 2n-3n
-11 =-n
-11 (-1)=-n (-1)
11=n
n=11

46. 4y + 3(y + 3) = 14y + 23
4y + 3y + 9 = 14y +23
7y +9 = 14y +23
9 -23 = 14y-7y
-14 = 7y
-14/7 = 7y/7
-2 = y
y = -2
2008-06-27 9:15 pm
45.) 3(n – 1) = 2n + 8

3n -3 = 2n +8

answer is (n = 11)

46.) 4y + 3(y + 3) = 14y + 23

4y + 3y + 9 = 14y + 23

answer is (y = - 2 )
2008-06-27 9:14 pm
3(n – 1) = 2n + 8
3n - 3 = 2n + 8
3n - 2n = 8 + 3
n = 11


4y + 3(y + 3) = 14y + 23
4y + 3y + 9 = 14y + 23
7y - 14y = 23 - 9
-7y = 14
y = -2
2008-06-27 9:14 pm
3(n-1) = 2n+8
3n-3 = 2n+8
3n-2n = 8+3
n = 11

4y+3(y+3)=14y+23
4y+3y+9 = 14y+23
7y+9 = 14y+23
7y-14y = 23-9
-7y = 14
y = 14/-7 = -2
2008-06-27 9:14 pm
45) 3(n-1) = 2n+8
3n-3 = 2n+8
3n-2n = 8+3
n = 11

46) 4y+3(y+3) = 14y+23
4y+3y+9 = 14y+23
7y+9 = 14y+23
9-23 = 14y-7y
7y = -14
y = -2


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