We need help with math?

Question

7b-(3a-8b) what is b?

|x|+|2x|-|x-1| x=2

6|4b-5|+3|2-2b| b= -1

Answer 1

7b -3a +8b = 0

15b -3a =0

- 3a = -15b

3a =15b

a = 15b/3

a = 15/3 b  

Answer 2

7b-(3a-8b) what is b?

Because of how this problem is setup.....you will have to solve for "a" then whatever you get for "a" substitute it back into the problem!

7b-(3a-8b) what is b?

Distribute what is in the parenthesis

7b - 3a + 8b = 0

Combine like terms

15b - 3a = 0

Add 3a to both sides

15b = 3a

Divide by 3

5b = a

7b - (3a - 8b) = 0

Substitute a into the equation

7b - [3(5b) - 8b] = 0

7b - (15b - 8b) = 0

Combine like terms in parenthesis first

7b - 7b = 0

|x| + |2x| - |x - 1| x = 2

|2| + |2(2)| - |2 - 1|

|2| + |4| - |1|

2 + 4 - 1

2 + 3

5

6|4b-5|+3|2-2b| b= -1

6|4b - 5| + 3|2 - 2b|

6|4(-1) - 5| + 3|2 - 2(-1)|

6|-9| + 3|4|

6(9) + 3(4)

54 + 12

66

Answer 3

1) 7b-3a+8b

7b+8b=3a

15b=3a

b=3/15a

b=1/5a

Answer 4

ok

I think this is what you want....

7b - 3a + 8b ==> 15b - 3a

if

15b - 3a = 0 ==> 15b = 3a ==> b = 3a/15  ==> b= 1/5 a

if x = 2 then

|2| + |2 * 2| - | 2 - 1| ==> |2| + |4| - |1| ==> 2+4-1 = 5

if b = - 1

6 * | 4 * ( - 1) - 5| + 3 * | 2 - 2 * (- 1)|

6 * | - 4 - 5| + 3 * | 2 + 2|

6 * | - 9| + 3 * | 4|

6 * 9 + 3 * 4 ==> 54 + 12 ==> 66