I need help with two problems:
1. 2b= 8-8b
2. 3x= 27-15x
if u jus got the answer for one of them...that's fine
2006-09-19 10:13:37 · 7 answers · asked by surferbabe_jl 2 in Science & Mathematics ➔ Mathematics
b = 8/10, or .8
x = 27/18, or 3/2, or 1 1/2, or 1.5
2006-09-19 10:15:46 · answer #1 · answered by Anonymous · 1⤊ 0⤋
The key to these problems is grouping the like terms. You want everything tied to a variable (b, x, etc.) on one side, and everything that is just a number on the other:
PROBLEM 1
Starting with:
2b = 8 - 8b
Add 8b to both sides:
10b = 8
Divide both sides by 10:
b = 8/10
Reduce the fraction:
b = 4/5
PROBLEM 2
Starting with:
3x = 27 - 15x
Add 15x to both sides:
18x = 27
Divide both sides by 18:
x = 27/18
Reduce the fraction:
x = 3/2
Make it a mixed fraction:
x = 1½
And it is always a good idea to check your answer by plugging the value back into the original equation to make sure it balances. I'll leave this step to you...
2006-09-19 10:16:09 · answer #2 · answered by Puzzling 7 · 3⤊ 0⤋
1. 2b = 8 - 8b
10b = 8
b = 0.8
2. 3x = 27 - 15x
18x = 27
x = 27/18 = 1.5
2006-09-19 10:18:06 · answer #3 · answered by Anonymous · 0⤊ 0⤋
1. 2b = 8-8b
2b+8b=8-8b+8b
10b=8
10b/10=8/10
b=0.8
2. 3x=27-15x
3x+15x=27-15x+15x
18x=27
18x/18=27/18
x=1.5
2006-09-19 10:18:10 · answer #4 · answered by Anonymous · 0⤊ 0⤋
1.10b=8
b=8/10=4/5
2.18x=27
x=27/18=3/2
2006-09-19 10:15:47 · answer #5 · answered by raj 7 · 1⤊ 0⤋
1.)
2b:8-8b
+8b
-----------
10b: 8
---- ---
10 10
b: .8
2.)
3x: 27-15x
+15x +15x
-----------------
18x: 27
---- ----
18 18
x: 1.5
2006-09-19 10:29:48 · answer #6 · answered by me 1 · 0⤊ 0⤋
Hi. Now that you have the answer, why...
2006-09-19 10:17:30 · answer #7 · answered by Cirric 7 · 0⤊ 0⤋