if x+3x is 7 more than y+3y then x-y =....
a) o
b) 3/7
c) 4/7
d) 7/3
e) 7/4
I really dont get this... please help...
2007-01-10 13:30:39 · 12 answers · asked by Anonymous in Education & Reference ➔ Homework Help
that was all the information they gave me buddy so dont be giving me any attitude... I'm so frustrated... pms sucks.
2007-01-10 13:36:47 · update #1
Put the equation like so:
x+3x = y+3y+7 ; using this formula going through each choice.
The answer is:
x = y + 7/4
PS please award best answer
2007-01-10 13:37:46 · answer #1 · answered by WhizMaster 4 · 0⤊ 0⤋
Alright, let's break it down. x + 3x is easier to write as 4x, right? And so is y + 3y. So the question becomes If 4x is 7 more than 4y what is x-y? So how can we write this?
If we write it as an equation we can just solve it, so here's what I would do.
4x = 7 + 4y.
Now, this helps us a lot because we can now get the 7 alone and solve for it. So, subtract 4y from both sides and we get:
4x - 4y = 7.
Now we have a common digit on the left and can pull it out because it applies to both. This makes:
4(x - y) = 7
Divide both sides by four and you get.....[can't give you this part, you should be able to get it from here!]
2007-01-10 21:38:40 · answer #2 · answered by Anonymous · 1⤊ 0⤋
Since x+3x is 7 more than y+3y x+3x+7=y+3y. You would then combine like terms and get 4x+7=4y. subtract 7 from both sides and get 4x=4y-7, then subtract 4y from both sides to get 4x-4y=-7, you would then divide both sides by 4, and your answer would be x-y=-7/4. This isn't one of the choices so I might have messed up somewhere, unless you typed the answers without the negative sign.
2007-01-10 21:38:41 · answer #3 · answered by Ace 5 · 0⤊ 0⤋
The answer is E.
The original condition: "x+3x is 7 more than y+3y" can be expressed like this:
y + 3y = x + 3x - 7
or
4y = 4x - 7
Subtract 4y from each side:
0 = 4x - 4y - 7
Add 7 to each side:
7 = 4x -4y
Divide each side by 4:
7/4 = x - y
2007-01-10 21:34:50 · answer #4 · answered by David G 5 · 1⤊ 1⤋
Just simplify the given conditions.
condition 1;
x + 3x = 7
4x = 7
x = 7/4
Condition 2;
y + 3y = 0
4y = 0
y = 0/4 =0
condition 3;
x - y = ?
substitutes;
7/4 - 0 = ?
then;
7/4 = ?
I hope this solutions will help you. Don't get so frustrated just study harder and you'll be fine.
2007-01-10 21:54:07 · answer #5 · answered by egan 5 · 0⤊ 0⤋
you need to know the value of x and y then if you can use a calculator then punch in x+3 times +7+y+3 time y and x minus y. its really simple after you get it well then ask your teacher for help
2007-01-10 21:37:42 · answer #6 · answered by mosas 2 · 0⤊ 0⤋
I don't want to tell you the answer, but I can help.
You can make the first equation (x+3x=7) equal to seven and the second equation (y+3y=0) equal to zero. Then you can solve for x and y and solve for the third equation (x-y=?)
I hope that helps. If it doesn't email me: mr_lump86@yahoo.com
2007-01-10 21:36:06 · answer #7 · answered by sealguy77 2 · 0⤊ 1⤋
x+3x=y+3y+-7
4x=4y+-7
u can probably take it on from there... too lazy to figure out
2007-01-10 21:39:49 · answer #8 · answered by Produh G 4 · 0⤊ 0⤋
e) 7/4
4x=4y+7
x=y+7/4
2007-01-10 21:38:10 · answer #9 · answered by notmyrealname 3 · 1⤊ 0⤋
x+3x-7=y+3y
simplify this.
you will then get the answer of E.
2007-01-10 21:36:32 · answer #10 · answered by x_scream22 2 · 0⤊ 0⤋