## Search found 14 matches

Wed Jan 28, 2009 6:34 pm
Forum: Beginning Algebra
Topic: This is quite graphic...
Replies: 2
Views: 2644

### Re: This is quite graphic...

Thanks for the reply Elizabeth, I went over the examples about 10 times last night and finally figured it out. Everything you're saying I know. I guess I didn't have the confidence in my work that I should have. The answer to the problem is indeed -13 and 23. if the tent is 10' wide then coming from...
Wed Jan 28, 2009 1:51 am
Forum: Beginning Algebra
Topic: This is quite graphic...
Replies: 2
Views: 2644

### This is quite graphic...

:wink: I don't know why I'm having so much trouble with this, obviously I'm missing something. SO here goes. I have a tent that's going to be staked out on a polar ice cap and as you can imagine it's cold and windy out here. My partner is the meticulous type and wants to know how high the tent is so...
Sun Jan 25, 2009 11:12 pm
Forum: Beginning Algebra
Topic: Graphing |7 - 3x| - 10 = 4
Replies: 4
Views: 5519

### Re: Graphing |7 - 3x| - 10 = 4

Hmmm, a question just came up. You wrote; Instead, consider the two cases. If -3x + 7 > 0, then 7/3 > x (or, as I prefer, x < 7/3). So, assuming x to be in this range, we then get: . . . . .|7 - 3x| - 10 = 4 . . . . .(7 - 3x) - 10 = 4 Here the sign didn't change. Is that because we are assuming that...
Sun Jan 25, 2009 10:42 pm
Forum: Beginning Algebra
Topic: Graphing |7 - 3x| - 10 = 4
Replies: 4
Views: 5519

### Re: Graphing |7 - 3x| - 10 = 4

I see that now. I got the idea after doing the graph and doing a little more reading but your explanation helps me even more.

Thanks Elizabeth!
Sun Jan 25, 2009 10:18 pm
Forum: Beginning Algebra
Topic: Graphing |7 - 3x| - 10 = 4
Replies: 4
Views: 5519

### Graphing |7 - 3x| - 10 = 4

I have a question on negative numbers in absolute value equations. For instance: |7-3x|-10=4 |-3x+7|-10=4 -3x+7=14 -3x = 7 x = - \frac 73 This is fine for me. I'm assuming that the result is a negative based on the division by -3. The book says that's correct. The other solution is what's giving me ...
Sat Jan 24, 2009 3:55 pm
Forum: Pre-Algebra
Topic: -1^2: is this equal to -1 or to 1?
Replies: 7
Views: 7624

### Re: -1^2

I think I see it now. The substitution is -1 not $-1^2$. obviously the square is then $(-1)^2$ and not $(-1^2)$.

There are two solutions when taking the square root of a positive number? Really? What's the other solution?

Thanks again!

Daniel
Sat Jan 24, 2009 2:03 pm
Forum: Pre-Algebra
Topic: -1^2: is this equal to -1 or to 1?
Replies: 7
Views: 7624

### -1^2: is this equal to -1 or to 1?

Ok, I did a little reading on this and thought I had the concept down but apparently I'm missing something. The big question is does -1^2 equal -1 or 1? It's -1 from the explanation I read which makes perfect sense to me, if -1^2 = (-1^2) = -(1)(1) then -1^2 = -1 . If, (-1)^2 this is (-1)(-1)= 1 So ...
Sat Jan 24, 2009 1:15 pm
Forum: Arithmetic
Topic: Simplify: I get y = (10-2x)/5 but book says y = (1/5)(10-2x)
Replies: 4
Views: 7038

### Re: Simplify: I get y = (10-2x)/5 but book says y = (1/5)(10-2x)

Hey Little Dragon, I know, isn't that annoying? In Linear equations they want the answer to look like y=\frac15(10-2x) but now that we're graphing, the very next chapter, they want the answer to look like y = 2-.4x . And they didn't say they wanted it in the simpler form. I'm still counting it as a ...
Fri Jan 23, 2009 10:58 pm
Forum: Arithmetic
Topic: Simplify: I get y = (10-2x)/5 but book says y = (1/5)(10-2x)
Replies: 4
Views: 7038

### Re: Simplify

"Ah, now I see!" said the blind man. :wink: y=\frac15(10-2x) is what the book says is correct. I say this is as correct y=\frac{10-2x}{5} but isn't this: y=2-.4x, simpler yet? I like the decimal form of the answer much better as I'm very used to converting fractions to decimals in my work. To me the...
Fri Jan 23, 2009 10:37 pm
Forum: Beginning Algebra
Topic: Transformation trouble: 3x + 3/2(2x - 1) = 2
Replies: 2
Views: 3865

### Re: Transformation trouble: 3x + 3/2(2x - 1) = 2

Elizabeth,
Thanks for the reply and apologies for not getting back sooner.
I figured out what I did wrong in the above equation. I didn't distribute properly. The answer is .58 or 7 divided by 12.
Thanks again!