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Started By
Message
Math people, simple algebra, is this person showing their work?(real)
Posted on 3/11/16 at 9:26 pm
Posted on 3/11/16 at 9:26 pm
Basically the old solving for two variables A and B
sin30=cos60=.5
sin60=cos30=.866
(Fx): -.5A+.866B=0
(Fy): .866A+.5B=100
A=.866B/.5
.866(.866B/.5)+.5B=100
2B=100
B=50
A=86.6
pretty easy, standard algebra
But is this person actually showing that? My question is in regards to step 3, while the equation works, I can't figure our how they got to that step.
Everyone knows I'm an idiot, but I'm also tired....can anyone see how they came to that equation?
-.866A+1.5B=0
This post was edited on 3/11/16 at 9:38 pm
17
Posted on 3/11/16 at 9:27 pm to Kujo
Please stop you're giving me flashbacks
Posted on 3/11/16 at 9:27 pm to Kujo
The answer is always C
Posted on 3/11/16 at 9:28 pm to Kujo
Grade your tests. It's your job not mine
Posted on 3/11/16 at 9:28 pm to Kujo
Looks like somebody drew 2 dicks in that graph
Posted on 3/11/16 at 9:30 pm to Kujo
You obviously do not understand standard algebra.
Posted on 3/11/16 at 9:31 pm to Kujo
Its pulling 100K
Thats it?
Ot poor
Thats it?
Ot poor
This post was edited on 3/11/16 at 9:32 pm
Posted on 3/11/16 at 9:33 pm to tigerbutt
Halp
Posted on 3/11/16 at 9:34 pm to Kujo
Looks more like trigonometry or calculus than standard algebra to me.
Posted on 3/11/16 at 9:37 pm to Kujo
This is trig. Not algebra
Posted on 3/11/16 at 9:40 pm to LSUTANGERINE
quote:
This is trig. Not algebra
it's not, forget the sin/cos
2x+3y=100
-4x+8y=24
simple algebra, the subject is statics, but the math on this problem is just algebraic
Posted on 3/11/16 at 9:40 pm to Kujo
He multiplied both sides of the Fx equation by (.866/.5), so now the equation is -.866A+1.5B=0. He did it so he could solve the system by elimination, since the coefficients of A are the same, with opposite signs now. Weird way to do it but it works.
Posted on 3/11/16 at 9:41 pm to Kujo
The answer to your question is that the student possibly cheated. Clearly she knew the answer beforehand and then "combined" steps beause she didn't quite know how to correctly get to the answer.
Posted on 3/11/16 at 9:41 pm to Kujo
quote:Answer: Who gives a frick
can anyone see
Posted on 3/11/16 at 9:42 pm to Kujo
quote:I don't know about the math, but their is plural.
is this person showing their work
Posted on 3/11/16 at 9:46 pm to Kujo
quote:
it's not, forget the sin/cos 2x+3y=100 -4x+8y=24 simple algebra, the subject is statics, but the math on this problem is just algebraic
If the student left out sin and cos, would his or her answer still be correct? I really don't know, so I am asking.
Nevermind, I saw sin and cos and hi-tailed it out of here without reading the problem. I see what you are saying
This post was edited on 3/11/16 at 9:49 pm
Posted on 3/11/16 at 9:46 pm to Ingeniero
quote:
He multiplied both sides of the Fx equation by (.866/.5), so now the equation is -.866A+1.5B=0. He did it so he could solve the system by elimination, since the coefficients of A are the same, with opposite signs now. Weird way to do it but it works.
This is what he did. He actually states it in the middle of the diagram.
Posted on 3/11/16 at 9:47 pm to motorbreath
quote:
Looks more like trigonometry or calculus than standard algebra to me.
it's statics. sum of forces in x = 0, sum of forces in y=0
Posted on 3/11/16 at 9:48 pm to motorbreath
quote:
Looks more like trigonometry or calculus than standard algebra to me.
It's a simple physics problem which requires trig and algebra to solve. No calculus though (limits, integrals Rieman sums, etc)
Posted on 3/11/16 at 9:49 pm to MaroonWhite
quote:
This is what he did. He actually states it in the middle of the diagram.
Yes, but why? Is that some common core bullshite math they're teaching now?
The way Kujo explained is how I would have worked it.
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