Math homework...need help!

[Mosinguy]

I'm not going to ask for the answer, I just want to be absolutely positive I did the question correctly so if one of you in the audience would "proof read" my answer/work and let me know if I did it right I would appreciate it. If I did something wrong, let me know.

I've got a graphing y=mx+b problem to this part: -3y<-9x-12. I am wondering, when I divide the -3 from the y to get y by itself and put the -3 onto the -9x, will I have -9/-3? Or will I have 9/3 because the negatives cancel each other out?


And right after I post I realize that the answer would be: y>3-4. Yeah not the best at math, the little things get me. I'm more of history and literature guy.

 

[Suprtek]

I hate math. When it came time for me to help my kids with their high school math, I actually went out and bought the teacher's version of their books so I could help them figure it out and see if the answers were right.

 

[jblomenberg16]

I'm not going to ask for the answer, I just want to be absolutely positive I did the question correctly so if one of you in the audience would "proof read" my answer/work and let me know if I did it right I would appreciate it. If I did something wrong, let me know.

I've got a graphing y=mx+b problem to this part: -3y<-9x-12. I am wondering, when I divide the -3 from the y to get y by itself and put the -3 onto the -9x, will I have -9/-3? Or will I have 9/3 because the negatives cancel each other out?


And right after I post I realize that the answer would be: y>3-4. Yeah not the best at math, the little things get me. I'm more of history and literature guy.

You are on the right track. You can divide both sides of the equation by (-3).

That gives you y < 3x + 4. (remember that dividing a negative by a negative = a postive).

 

[Bunnykid68]

How did the X just disappear?

 

[Mosinguy]

You are on the right track. You can divide both sides of the equation by (-3).

That gives you y < 3x + 4. (remember that dividing a negative by a negative = a postive).

Yep, on the quadruple check of my work I caught that. I can not stand math.

 

[Mr Evilwrench]

Start by dividing by the 3, you get -y<-3x-4. Then the -1, you get y>3x+4. The -1 flips the whole graph upside down. Your constant is -12, so it gets divided by -3 yielding +4. Can't really explain it without the answer.

 

[Mosinguy]

How did the X just disappear?

Caught that too, thanks!

 

[45calibre]

You are on the right track. You can divide both sides of the equation by (-3).

That gives you y < 3x + 4. (remember that dividing a negative by a negative = a postive).

yes, mosin im not sure how you got your answer

 

[Bunnykid68]

Caught that too, thanks!

No, really, where did the X go? if you divide all that by -3 you get Y<3X+4 don't you? Or does it have something to do with this graph you mentioned?

 

[Mosinguy]

No, really, where did the X go? if you divide all that by -3 you get Y<3X+4 don't you? Or does it have something to do with this graph you mentioned?

It's just a regular y=mx+b equation and I forgot to include the x on the written part.

 

[Mosinguy]

yes, mosin im not sure how you got your answer

Believe me, on these little mistakes, not even my teachers know where I went wrong. But I've got it now and finished my homework. Thanks for the help guys!

 

[Rookie]

The answer is bacon.

 

[blamecharles]

The answer is bacon.

dont worry

 

[zebov]

Don't forget to flip your "<" to a ">" when you multiply or divide by a negative number.

 

[Que]

A negative divided by a negative is a positive.

 

[sepe]

I know that feel. I can't math either. Just think, if you're lucky you might get to take more than 4-5 math courses in college. Try getting a professor to explain something that wasn't ever properly explained or you somehow didn't grasp. Most I've known haven't been very patient.

 

[SSGSAD]

A negative divided by a negative is a positive.

And, a neg. X a neg., is a POS. .....

 

[Sanguine Samurai]

Not only do you have to devide the -9x by -3 but you also have to devide the -12 by -3 because whatever you do to one side of the inequality you have to do to the other side equally.

First you have to devide the -3 form both sides of the ineqality so you will have y<3x+4. Like this -3y/-3<-9x/-3 - 12/-3
which is
y<3x+4
Remember to watch you signs.
A negative number multiplied/devided by a negative number is always positive.
There is not enough information to answer the inequality any further. You can graph the inequality if you use the substitution method to find the values for x and y.

For instance
xly
1l7
-1l1

If you substitute x with 1 y=7

if you substitute x with 0 y=4

I hope this helps!

Like someone above mentioned it is hard to help with out showing the answer. Good Luck!