Got Homework?
Connect with other students for help. It's a free community.
Here's the question you clicked on:
 0 viewing

This Question is Closed

85295jamesBest ResponseYou've already chosen the best response.0
1/3x + y = –1 y = 4+1/3 x
 one year ago

theEricBest ResponseYou've already chosen the best response.1
Do you know what it means to solve them by graphing? I'm unsure! I'm into calculus 3 and I can't think of what it means. Does this sound familiar? You're looking for a point (x,y) so that \[\frac{1}{3}x+y=1y=4+\frac{1}{3}x\]
 one year ago

theEricBest ResponseYou've already chosen the best response.1
Because I would immediately think to use algebra. I'm looking online for a refresher. If you multiplied by (1), though... \[(1)\frac{1}{3}x+(1)y=y=(1)4+(1)\frac{1}{3}x\]
 one year ago

theEricBest ResponseYou've already chosen the best response.1
But that would be changing values. I'm not sure right now, sorry, but I will research how to solve a syste of equations by graphing now.
 one year ago

theEricBest ResponseYou've already chosen the best response.1
Wait.... I should've asked  are those two separate equations? I thought they were, and then I decided maybe they weren't..
 one year ago

theEricBest ResponseYou've already chosen the best response.1
If you have two line equations and they share just one (x,y) point, then they intersect on a graph. You just have to be able to plot the lines on grid paper and look for the intersection. For really random lines you will need to calculate, but for math problems designed for learning, you should be fine with just graphing.
 one year ago

theEricBest ResponseYou've already chosen the best response.1
So \[\frac{1}{3}x + y = 1\]and\[y=4+\frac{1}{3}x\] ?
 one year ago

theEricBest ResponseYou've already chosen the best response.1
THAT I can do for sure! :)
 one year ago

theEricBest ResponseYou've already chosen the best response.1
That would be a system of equations...
 one year ago

theEricBest ResponseYou've already chosen the best response.1
Sorry I delayed due to uncertainty. I'll guide you through it now. First, you should know how to plot a line, given it's equation. Second, you should rearange each equation so that you can easily plot it (I recommend making your equations look like y=mx+b) Third, you need to plot both lines. Fourth, you can the see where they intersect. So look at what the point is.
 one year ago

theEricBest ResponseYou've already chosen the best response.1
Of the four steps, where would you like to start? You need to do all four, but maybe you already know how to plot a line with it's equation. If you don't, let me know, please!
 one year ago

theEricBest ResponseYou've already chosen the best response.1
Actually there is a 5th step. You have to check to make sure that the (x,y) point you found to be the intersection actually IS on both lines buy using eliassaab's method for substituting.
 one year ago

85295jamesBest ResponseYou've already chosen the best response.0
i got three pics to choos from and i dont know how to load them
 one year ago

85295jamesBest ResponseYou've already chosen the best response.0
B. no solution C. no solution D. infinitely many solutions
 one year ago

theEricBest ResponseYou've already chosen the best response.1
Once I put the equations into y=mx+b form, which I will do in a moment, you will see that it must be "no solution". Once you can plot the two equations, you will see why!
 one year ago

theEricBest ResponseYou've already chosen the best response.1
For now, think about intersections. As simple as they are. They are the point or points where two things meet! If they never meet, then there are no intersections. If they are together at every point, there are infinately many points of intersection.
 one year ago

85295jamesBest ResponseYou've already chosen the best response.0
dw:1346094672501:dw
 one year ago

85295jamesBest ResponseYou've already chosen the best response.0
dw:1346094737400:dw
 one year ago

theEricBest ResponseYou've already chosen the best response.1
I'll trust that you can algebraically manipulate your equations to look like y=mx+b. \[\frac{1}{3}x+y=1\rightarrow y=\frac{1}{3}1\]
 one year ago

theEricBest ResponseYou've already chosen the best response.1
and \[y=\frac{1}{3}x + 4\]
 one year ago

theEricBest ResponseYou've already chosen the best response.1
No you can't do the algebra? Well lets look at the one line's equation: \[\frac{1}{3}x+y=1\]
 one year ago

theEricBest ResponseYou've already chosen the best response.1
Now, you have a goal. You want that "y" to be on its own side, all alone.
 one year ago

theEricBest ResponseYou've already chosen the best response.1
There's a rule of thumb, "if you do something to one side, do it to the other". This is so you do the same thing to all sides. By changing each side in the same way, each side will be different from what it was before. BUT each changed side will be equal to each other, so you know it's a legitamate equation! Here's an example, to help you understand what I mean. \[5=2+3\] add 10 to both sides \[5+(10) = 2+3+(10)\] and solve \[15=2+3+10\] \[15=15\]
 one year ago

theEricBest ResponseYou've already chosen the best response.1
Since both sides are equal, each side is okay to work with. And the variables are still the same too. \[x=1\]add 10 to both sides\[x+(10) = 1+(10)\]\[x+10=11\]x still equals 1!
 one year ago

theEricBest ResponseYou've already chosen the best response.1
So changing both sides is a great thing to do! I was adding 10 in those examples. To your equation, try adding \[\frac{1}{3}x\] to both sides. Here is the equation again: \[\frac{1}{3}x+y=1\]
 one year ago

theEricBest ResponseYou've already chosen the best response.1
Tell me when your done, so I know you've seen the result, and we can talk about why I told you to add (1/3)x.
 one year ago

theEricBest ResponseYou've already chosen the best response.1
Sorry I've taken so long!
 one year ago

theEricBest ResponseYou've already chosen the best response.1
Thanks! So, have you done the addition? What did you get?
 one year ago

theEricBest ResponseYou've already chosen the best response.1
\[\frac{1}{3}x+\frac{1}{3}x+y=1+\frac{1}{3}x\]is what you want to simplify, here. I took the liberty of adding to both sides :P Just to be clear! :)
 one year ago

theEricBest ResponseYou've already chosen the best response.1
Okay, I'll go on without you... But I hope that you'll ask me about anything you don't understand or that you see might be wrong! I got this much, much more understandable equation,\[y=1+\frac{1}{3}x=\frac{1}{3}x1\] which looks like\[y=mx+b\] which is easier to plot by hand.
 one year ago

theEricBest ResponseYou've already chosen the best response.1
Nope! Just look at either equation, and the number multiplying x, known as the slope, is \[\frac{1}{3}\] The slope is, you go up one unit (along y) and you go over 3 units (along x). The slope goes up and to the right. So look for that.
 one year ago

theEricBest ResponseYou've already chosen the best response.1
Since they habe the same slope, they are parallel, and thus cannot intersect.
 one year ago
See more questions >>>
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.