[bboyMarco]

Ok I'm im GATE classes something like AP but for junior high school. And well i'm 13 but im taking 9 grade math classes and I need help with some stuff so can so people exlpian this to me. Some subjets I need help with are Number properties, Operations, and linear expressions, and some other stuff too.Here's so examples;

When is 2x[size=1]2[size=1] + x- 100 More than or equal to 0 true for all real numbers?

Solve 2/3(-6x+9) - 1/2(2x- 4) >23

Solve for X
x=3(5-2x)-6 More than or equal to 4x

How many counterexamples would be needed to refute the assertion for the following example?
x + 2 > 5 is always true for he replacement set {0,1,2,3,4,5,6,7}

Chose the point that lies on the graph of this equation:
1/2y - x =3

Determine the equation of a line that is perpendicular to 2y - x = 9
and passes through (-1, 7)

And some other ones, but i really don't understand them. Can anyone help?

[Harry Popper']

math is from hell. Rebell.

[#1coolkid]

Math???? WHO NEEDS IT just right numbers down and ur teacher wont know my teacher just looks at it she doesn't collect it good 4 me huh?

[MuffinJuice]

Originally posted by bboyMarco

i dont have time or knowledge to do all of them but heres the guidance i can offer.



Solve 2/3(-6x+9) - 1/2(2x- 4) >23

for these problems, look at them like a+b=c
in stead of
a+b>c

then at the end of the problem, replace the = with a >

you have some common factors in the parenthesis, a hint, turn
(-6x+9) into -3(2x+3)
that will give you (2/3)*3 write it out on paper and its pretty obvious that the 3 cancels out and you have 2(2x+3)

use that logic and simplify the left side of the ">" you'll probly end up dividing both sides of the > by some number and ending up with (x-something) > some number then just solve.




How many counterexamples would be needed to refute the assertion for the following example?
x + 2 > 5 is always true for he replacement set {0,1,2,3,4,5,6,7}


i dont understand the question, but if you plug 0 into the equation, its wrong.... i guess only 1


Chose the point that lies on the graph of this equation:
1/2y - x =3

if the question is supposed to say chose "A" point and not "THE" point, then i think i know how to do this...

solve the equation for y. what that means is you get it to look like y= stuff

move the x over, multiply by 1/2 etc...



Determine the equation of a line that is perpendicular to 2y - x = 9
and passes through (-1, 7)


to do this, you need to set it up in slope intercept form. (right now it is in standard form)
slope intercept form looks like...
y= mx + b

(m is the slope ((rise over run, change in y/ change in x)), and b is the y intercept (where y =0)


since its a multiple step problem, im going to do them here assuming you know almost nothing about this stuff.

write the equation

2y - x = 9
ok-- solve for y (put it in slope intecept form)
add x to both sides
2y -x +x = 9 + x
therefore
2y = 9+x
divide both sides by 2
2y/2 = 9/2 + x/2
therefor
y= 9/2 + x/2
since we want it to look like y=mx + b , we will rewrite it
y= (1/2)x + 4.5
in this equation m= 1/2 ----> the slope is 1/2

you can now graph the first line.

the second line will be perpendicular to this line

this one's slope will have a slope of -(1/2) because that will make it perpendicular

take the new equation y= -(1/2)x + b and plug in your point
(-1, 7) for x,y in the new equation

7= -(1/2)(-1) + b

solve for b.

whatever b comes out as, put it in the end of this equation,

y= -(1/2)x + (B) replace (B) with the b you just got. thats how you solve those problems



And some other ones, but i really don't understand them. Can anyone help?

[bboyMarco]

Thanks for trying muffin juice i managed to solve a couple with your help and bboysk8 was helping me too. Anyways here's some more if anyone else can help

When is 2x2 + x- 100 More than or equal to 0 true for all real numbers?
Note: The second 2 in the problem is squared and more than or equal to is a sign that kinda looks like this >_ but together

Solve 2/3(-6x+9) - 1/2(2x- 4) >23

Solve for X
x=3(5-2x)-6 More than or equal to 4x

Choose three consecutive odd integers such that three times the second decreased by 4 is equal to twice the third increaded by 15

Selet the equation that is equivalent to 5(x +1)- 2(3x- 2)= 9x +1

[bboyMarco]

Thanks for trying muffin juice i managed to solve a couple with your help and bboysk8 was helping me too. Anyways here's some more if anyone else can help

When is 2x2 + x- 100 More than or equal to 0 true for all real numbers?
Note: The second 2 in the problem is squared and more than or equal to is a sign that kinda looks like this >_ but together

Solve 2/3(-6x+9) - 1/2(2x- 4) >23

Solve for X
x=3(5-2x)-6 More than or equal to 4x

Choose three consecutive odd integers such that three times the second decreased by 4 is equal to twice the third increaded by 15

Selet the equation that is equivalent to 5(x +1)- 2(3x- 2)= 9x +1


Here's another one. My calculator and computer are to stupid to show the signs so here's a picture of the problem this is like one of the hardest problems in this and i'm barely in 8th, but nobody i know can help me with this one. maybe some smart like VP or sk8 can help me with this one

[flobotopics]

ASK ANAKTIX he is a wiz. if he wants to help you he'd be the one to ask

[Harry Popper']

I have shown anaktix the light. Turned him against his recent love....math. He now sees that math is just a evil being lurking around the corner waiting to pounce on you and waste your time.

[bboyMarco]

Originally posted by Harry Popper'
I have shown anaktix the light. Turned him against his recent love....math. He now sees that math is just a evil being lurking around the corner waiting to pounce on you and waste your time.

DAMN YOU HARRY POPPER

[Vice President]

math is the shit. but, much like windmills, it feels better to teach yourself. until you get to mathmatical induction in precal. that's a bitch. hahaha i taught that shit to myself this morning and got a 100 on my test. byyyotch.

[bboyMarco]

But our teacher to switched and the new bitch taught our class the same material as the normal people , them got our old teacher and expected us to already know it. So i know nothing of this. I tried to teach myself the quadratic formula and kinda know it but the rest is just blanks t me.

[bboy tekniqal]

What is mathematicaly induction in precal?

I fucked up last year, so I got sent to advanced algebra instead of precalc, but we get taught pretty much the same thing as precalc.

Ironically, Advanced Algebra sounds far harder than PreCalc.

[Vice President]

i disagree. when i think of algebra, i think of easy whores. when i think of calculus, i think of bitches. and OBVIOUSLY, advanced easy whores are still much easier than pre-bitches. algebra is mostly common sense anyway.

[FlYgUy64]

hey bboymarco
yea, i'm juss like you, i take all the high classes in 8th grade
i'm assumin you already figured out the old problems u posted, but math is my good subject, so if u need help juss pm me or im me on aim>>> flyguy6491
http://www.coolmathalgebra.com/ <<<< dat mite help ya lil bit

[bboy tekniqal]

What is mathematical induction though?