Naku dahil kay Patty naadik nako magsagot sa Yahoo Answers! You just can't help but feel good pag nasasagutan mo yung mga questions na hindi kayang sagutin ng iba. Wahahahah! Wahahahaha! Lalo na pag ikaw tyung napiling best answer, you have that pride! Waahahaha! I just joined this thing the other day so I just have 3 best answers so far.

Question
2u^2=-7u-5

This is how I worked it out:

4u=-7u-5

so I added 7 to both sides and got:
11u=-5...divided by 11

So answer is u=-5/11

YES OR NO??
Answer
No!

4u = 2^2*u

Here goes:
Transpose the left side to the right
2u^2 +7u +5 = 0

Factor

(2u+5)(u+1) = 0

u = -5/2
u = -1

Asker's Comment
Great Thanx! :)

Question
In a crate of mangoes, 14% were bad. If 258 mangoes were good, find the total number of mangoes in the crate.

Please also tell me how you worked it out. if I can understand your method, 10 points!
Answer
if we have 14% of the mangoues as bad.

then 100% -14% = 86%

it means we have 86% of good mangoes

If we have 258 good mangoes

let:
x = total number of mangoes

86% of x is 258

in eq form

.86x = 258

x = 258/.86

x=300
Asker's Comment
Good calculations and simple method!

Question
I'm given 2 cordinate sets. (5,1) (8,-2) for example. I can find the slope, which is 3/-3 ( I think) and now I need the y-intercept. I want all of this information to plug into the formula at the end Y=MX+B (M=slope B=y-intercept Y and X are cordinates)

So can anyone tell me how to find the y-intercept? Sorry if I have any information wrong in my question.
Answer
y=mx+b

solve the slope
m= (y2-y1)/(x2-x1)

m= (-2-1)/(8-5)

m=-3/3

m=-1

y= -x + b

Substitute a given point:

using (5,1)

1 = -5 +b

b = 6

using (8,-2)
-2 = -8 + b

b= 6

final answer:

y = -x + 6
Asker's Comment
Thank you everyone. This one was the clearest for me though.

In general, the questions are easy, I just don't it why people find it hard.