2-5m=13 steps again...

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2-5m=13 steps again...

Mathematics
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Subtract 2 from both sides first.
What did you get?
11

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Other answers:

Now divide both sides by -5
What did you get?
but that comes out to 2.2... and it needs to come out as a whole number..
That would be - 2.2 and it cannot come out as a whole number unless you copied the problem wrong.
okay.. the real question is.. 13=5m-2 i didnt think it would natter if you flopped it around..
You didn't "flop it around". You changed 5m-2 to its opposite. That's like saying, ok, I'll just change this 10 to -10
it still comes out 2.2...
Add 2 to both sides.
\[13+2=5m-2+2\]
\[15=5m\]
Divide both sides by 5
and the answers 3?
\[\frac{15}{5}=\frac{5m}{5}\]
yep
okay tell me if i get this right to this next question.. -15=2t-11
so would you add 15 to both sides?
ok
Remember you are trying to get the variable by itself. The variable has been multiplied by 2 and then had 11 subtracted from it. How would you "undo" those things so that the variable can be by itself?
so.. then would you do -2t then? so then you could get rid of it?
You "undo" the stuff in reverse order. The variable was multiplied by 2 and 11 was subtracted. To undo that add 11 and then divide by 2
oh.. i see that now. sorry.. this is really frustrating..
Well I know it is but if you keep at it, all of a sudden the light will come on.
yeah, after i figure out what to either use to "undo" then i got the rest of the problem.. its just i never know what number to either subtract from or add.. you know what i mean?
I do know what you mean. Just always focus on getting the variable by itself by "undoing" the stuff. What did you get for this problem?
i got, t=-2
that was very good. Do you have another one?
yes i do, 7k-5=-19
Ok. What do you think comes first?
and this is the part i mean i have troubles with.. like i never know if you would add -5bor -19..
What is the variable?
I don't mean the solution. I just want you to identify the variable. Is it x or y or ...what is it?
the variable is k
Yes. Good. Now look at it. Is it multiplied or divided by something?
7
Exactly. So at some point we're going to have to reverse that by dividing by 7.
But first, was anything added or subtracted to or from the k?
yeah because the problem is 7k-5
Yes you are correct but I want you to tell me specifically what the number is and whether it was added or subtracted.
|dw:1328405964795:dw|
|dw:1328406078466:dw|
|dw:1328406166988:dw|
so for my question here 7k-5=-19 first i going to add -5 to -5 and -19 then rightt?
5 is subtracted because it says -5 so you should add 5 to both sides.
okay
Let me draw it for you in a different way
|dw:1328406347372:dw|
Now divide both sides by 7
so the answer all together then would be, k=-2
|dw:1328406418593:dw|
Yes. Good. Do you have another one?
yeah, 13=4x-11
What are you going to do first?
|dw:1328406584682:dw|
What first to get x alone?
|dw:1328406584851:dw|
this right??
Wow!1 You are very smart!!
i just did it??! yay! lol. but.. im still not feeling very confident with it quite yet..
Do you have another one?
okay, this one i have to draw out..
ok
|dw:1328406824918:dw|
|dw:1328406896963:dw|
wait.. so like how would u figure that out.. like first step..
|dw:1328407053667:dw|
so then 3 would go under the 10-7
yep
|dw:1328407194767:dw|
then you would divide.. but what would u do to divide in this case?
We could divide by 1/2 but did anybody ever teach you that dividing is the same as multiplying by the reciprocal?
ive heard that
So dividing by 1/2 is the same as multiplying by 2. It might be easier to just multiply by 2
|dw:1328407410240:dw|
oh, i kinda see this noww
Do you have another one?
6+n/5=-4
|dw:1328407657571:dw|
so first would you subtract 6 to 6 and the -4?
Subtract 6 from both sides.
-10
|dw:1328407833632:dw|
then what/
Well, we could divide by 1/5 or multiply by 5. Which do you choose?
multiply
good choice.
yeahh so then -10 *5?
yep
|dw:1328408025248:dw|
on my math homework now, i just finished 7 problems.. and before your help i couldn't even finish one.. THANKS!!!! :)
wonderful!! You keep at it sweetheart, and you'll be a star.
lol now.. how would u figure this one? w+3w=20
Well now they threw us a curve ball, didn't they?
But this is easy. Just stay with me and answer by questions which may seem foolish.
kk
What is 1 dog +3 dogs?
4
4 what?
dogs
What is 1 dollar + 3 dollars
4 dollars
Now what if I said that I don't want to write out dollars all the time so I am just going to use d What would 1d + 3d be?
4d
And supposing we would all agree that d means 1d then what would d+3d be?
4d right?
right
so now in your problem you have w + 3w What do you suppose that is?
4w
Exactly. So now your problem is 4w=20 How would you solve that?
divide by 4 so 20 divided by 4 would be 5
Good. perfect!!
so now theres this.. 3(y+5)=21
So have you heard of the distributive property?
yeahh, we did it before.. but i forgot all about it.. but im sure ill remember once i see it again..
|dw:1328409800280:dw|
Does that look familiar?
idkk.. not really.. lol
|dw:1328409877024:dw|
|dw:1328409931974:dw|
oooh yeahh!
you have to "distribute' the 3 to the y and to the 5
so, 3y+15?
Great!!
6a+7-a+-18
Did you get the other one?
yes i got y=2
|dw:1328410272373:dw|
That's what I got also.
okayy cool
What about 6a-a+7-18
soo would that be 5a+7=18?
Oh. There's an equal sign. Yes. 6a-a=5a
okayy
so a=-5?

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