Posted by **Sara!** on Wednesday, June 9, 2010 at 7:06pm.

plz how do you solve these?- i keep getting the wrong answer

1. 3z/2 - 17/3 = 2z/3 - 3/2

2. 2/5b - 1/4b =3

3. 23 - 6g = 19

please show me step by step how you do these

- MATH! -
**Ana**, Wednesday, June 9, 2010 at 7:25pm
1. Make the denominators alike.

3z/2 - 17/3 = 2z/3 - 3/2

9z/2 - 34/6 = 4z/6 - 9/6

Add 34/6 to both sides of the equal sign. The -34/6 and the +34/6 will cancel out on the left. The +34/6 is added to -9/6

9z/6 = 4z/6 + 25/6

Subtract 4z/6 from both sides. It will cancel out on the right side. And it will be subtracted from 9z/6 on the left.

5z/6 = 25/6

Then divide 5/6 from 5z/6 and 25/6, You'll have to multiply the reciprocal of 5/6, which is 6/5.

z= 25/6 * 6/5

z= 150/30 = 5

z= 5

- MATH! -
**Ana**, Wednesday, June 9, 2010 at 7:32pm
2. Make the denominators alike.

2/5b - 1/4b =3

8/20b - 5/20b = 3

Then subtract 8/20b and 5/20b.

3/20b = 3

Then multiply 20b by both sides. It will cancel out on the left side, leaving 3 alone.

3=3(20b)

3=60b

Divide 60 by 60b and 3.

b= 3/60 <-- 1/20 (Simplified)

- MATH! -
**Sara!**, Wednesday, June 9, 2010 at 7:33pm
how do you solve # 2

- MATH! -
**Sara!**, Wednesday, June 9, 2010 at 7:35pm
oh i mean # 3

- MATH! -
**Ana**, Wednesday, June 9, 2010 at 7:37pm
Subtract 23 from both sides. It will cancel out with the +23 on the left.

23 - 6g = 19

-6g= -4

Divide -6 from -6g and -4.

g= -4/-6 <--- g= 2/3

- MATH! -
**Sara!**, Wednesday, June 9, 2010 at 7:38pm
# 2 is 20

- MATH! -
**Ana**, Wednesday, June 9, 2010 at 7:40pm
No the answer to #2 is 1/20 or .05

If it was 20 then the answer would be 3, it'd be 0.0075

- MATH! -
**Sara!**, Wednesday, June 9, 2010 at 7:49pm
it is 3!

- MATH! -
**Reiny**, Wednesday, June 9, 2010 at 8:00pm
I always get rid of all my fractions.

#1 look at the denominators, their LCD is 6 , so multiply each term by 6 to get

9z - 34 = 4z - 9

5z = 25

z = 5

#2.

2/5b - 1/4b =3

multiply each term by the LCD, which is 20 to get

8b - 5b = 60

3b = 60

b = 20

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