math help for my daughter ALGEBRA
 

y=3/4x-8 y=-1/2-3

can anyone help???

huh?

Sorry, I hate math, but I'll give you some emotional support to help you through this tough time. lol.

hmmm....might have to ask my daughter

LOL , I have 2 older ones who are LONG out of High School, wish they were here to help.. algebra was NOT my thing either... LOL..

What exactly are you trying to solve in the equation. I could help but i need more info?

PM me

I'm sitting at work bored an actually had fun trying to solve it, I miss school :p Are you trying to get x though? It's been so long since highschool lol...sigh

I wrote this down quickly so I'm not sure if it's the right answer but it was a nice quick break from work (I love math, I'm a geek)

Since you know what y is, you insert that value for y and you get:

-1/2-3 = 3/4x-8

First, you need common denominators if you want to add/subtract fractions. since the only fraction we need to worry about right now has a 2 on the bottom, put a 2 on the bottom of the other numbers we need to add an subtract. 3 becomes 6/2 and 8 becomes 16/2. Same value, just a common denominator. I'll put brackets around the fractions so they're easier to decipher in computer type. You end up with:

-(1/2) - (6/2) = (3/4x) - (16/2)

Now you can easily simplify the left side. You add or subtract the top numbers, so -1 - 6 = -7. Your new value for that side becomes -7/2:

-7/2 = (3/4x) - (16/2)

Simply add the 16/2 to both sides, which cancels it out on the right side and adds it to the left side. The bolded numbers cancel each other out and equal 0:

-(7/2) + (16/2) = (3/4x) - (16/2) + (16/2)

Add the -7 + 16 to end up with 9/2 on the left side:

9/2 = 3/4x

If you multiply 4x (in fraction form, 4x/1), the 4x will cancel out on the right side:

(9/2) * (4x/1) = (3/4x) * (4x/1)

When multiplying fractions, you can multiply straight across - top number times top number, over bottom number times bottom number. 9 * 4x = 36x, and 2 * 1 = 2. You end up with 36x/2:

36x/2 = 3

Now you can divide 36 by 2 and you end up simplifying to 12x:

12x = 3

To get x alone, you must divide both sides by 12:

x = 3/12, or simplified to x = 1/4

Shoot - I got a totally different answer so I'm deleting mine. It's been 40 years since I took algebra.

I think this is right.

Isn't this kinda cheating? :D:D:D:D:D

I remember doing that crap, it was horrible. I HATE fractions. I'm glad business students are allowed to have calculators and Excel.

Actually it is wrong. X=6


9/2 = 3/4x

Up to this point you are correct.

However you simply need to multiply by 4 not 4x.

Thus you should get 36/2 = 3x
Simplified is 18 = 3x
18/3 = X
X=6

If you multiply 4x (in fraction form, 4x/1), the 4x will cancel out on the right side:

(9/2) * (4x/1) = (3/4x) * (4x/1)

When multiplying fractions, you can multiply straight across - top number times top number, over bottom number times bottom number. 9 * 4x = 36x, and 2 * 1 = 2. You end up with 36x/2:

36x/2 = 3

Now you can divide 36 by 2 and you end up simplifying to 12x:

BTW...Dividing 36x/2 gives 18x NOT 12x

12x = 3

To get x alone, you must divide both sides by 12:

x = 3/12, or simplified to x = 1/4

Oops, I was a step ahead of myself and divided by 3 (the next step) instead of by 2!

I assumed the 4x was on the bottom, as in (3)/(4x) ... if she meant (3/4)x, then you are correct, you would just multiply by 4 because that would make it 3x/4

Algebra!?? Eeeeeeeeeeek!!!!! *runs away* :D

I mean, used the 3 in the next step, not that dividing was the next step :rolleyes: Just to clarify!

Oh i see. I was under impression that it is (3/4) x. Either way, the logic is solved given whatever equation.