Are these right?

M

~Midnight.Kitten~

Junior Member
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Jun 27, 2005
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87
are these right?

1) 2x=2

my answer: x=0

2) x+5=17

my answer: x=13

3) x + 6 = 8

my answer: x=3

Sorry There's so many.
 
You can check them by plugging x back in.

2 * 0 = 2
No.

13 + 5 = 17
No.

Can you check the last one?
 
When doing problems like these, think to yourself, "What can I do to isolate x" The idea of these problems is to have x by itself on one side and everything else on the other.

1) 2x=2

For this question, what operation can you do that would isolate x? Since the coefficient of x is 2, then divide both sides by 2.

2x/2 = 2/2

x = 1

2) x+5=17

What operation would get x alone here?
To have x alone on its side, subtract 5 from the left side of the equation to remove the 5
But remember, for these types of questions you need to keep the equation balanced, so you must subtract 5 from the other side as well

x + 5 - 5 = 17 - 5

x = 12

Do the last question and maybe some other for us to check your work.
 
1) 2x=2
my answer: x=0

Look at it this way, Black Cat:
if 2 apples cost $2, how much does one apple cost?

2x=2 works same way: if 2 x's equal 2, what does 1 x equal?

2) x+5=17
my answer: x=13

both sides must equal SAME thing; what must be added to 5 to give 17?
YES: it's that simple....
 
Denis said:
1) 2x=2
my answer: x=0

Look at it this way, Black Cat:
if 2 apples cost $2, how much does one apple cost?

2x=2 works same way: if 2 x's equal 2, what does 1 x equal?

2) x+5=17
my answer: x=13

both sides must equal SAME thing; what must be added to 5 to give 17?
YES: it's that simple....
Click to expand...

Ironically, I do Have a Black Kitten..but anyway 17-5 is 12 so x would equal 12.and thats all?I thought there was more.
 
YES, that's all...quit complicating things!

Ok let's see your "x-rated" abilities now:

2x + 3 = 13 : what's x?
 
Nope! Try again.

2*x = 10 <== That is correct. Now what?
 
~Midnight.Kitten~ said:
Divide 10 by 2 so that x=5 ?
Click to expand...

YES Black Cat.
If 2 x's cost 10, how much does 1 x cost?
We told you that before...whatdo you not understand?

if 5a = 40, then a = 8
(if 5 apples cost 40 cents, then 1 apple costs 8 cents)

When you see something like 5x, don't get all nervous!
All it means is 5 "something"
 
I know, its justt my math teacher always complicated it all and added all this extra stuff, so i get confused with it really easily.
 
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