A community for students.
Here's the question you clicked on:
 0 viewing
anonymous
 one year ago
Please help me..... =*(
Line A has slope of 5/3 and passes through the point (2,7). What is the xintercept of line A?
anonymous
 one year ago
Please help me..... =*( Line A has slope of 5/3 and passes through the point (2,7). What is the xintercept of line A?

This Question is Closed

Zale101
 one year ago
Best ResponseYou've already chosen the best response.0First, use the given infiltration to construct the equation of line A, then set y equals to zero and solve for x. The x's that you solved for are the xintercepts.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0dw:1439228461781:dw

Zale101
 one year ago
Best ResponseYou've already chosen the best response.0You can use the point slope formula and plug all the given info in. Do you remember the point slope formula?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I have a problem understanding where to put the numbers... In what cases do you replace it for Y and in what cases do u replace it for b?

Zale101
 one year ago
Best ResponseYou've already chosen the best response.0\(\Large yy_1=m(xx_1)\) Where x1,y1 is the given point and m is the slope

Zale101
 one year ago
Best ResponseYou've already chosen the best response.0That is the point slope formula ^^

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0is there any way to solve the problem without the point slope formula? because the solution doesnt use it

Zale101
 one year ago
Best ResponseYou've already chosen the best response.0Or you can use y=mx+b Plug x,y by the given point and m for the slope Then solve for b After solving for b, you then go back and write y=mx+b again and plug in the yintercept (b) and slope. Then, you have the equation solved.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0yea thats what i have a problem understanding... in what case do you use it for b and in what case do you use it for Y???????????

Zale101
 one year ago
Best ResponseYou've already chosen the best response.0All the matters is to construct the equation of line A so you can set y to zero and solve for the xintercept. There's two ways you can do it.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0i really need to understand that for future problems

Zale101
 one year ago
Best ResponseYou've already chosen the best response.0Yes, i understand. dw:1439228871702:dw

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0then what about the Y what is the y then?

Zale101
 one year ago
Best ResponseYou've already chosen the best response.0m and b (the slope and the yintercept) are constants. Meaning, when writing the equation, the numbers are giving for them. But x and y is changing. It does not have a constant number. the x is the input and any numbers from the xaxis can be plugged into it. There's no constant, specific number to plug. It is changing. Same goes to y. Y is changing and it is the output. You can plug whatever number you want from the yaxis. There's no specific number.

Zale101
 one year ago
Best ResponseYou've already chosen the best response.0For example. The graph y=x dw:1439229116348:dw

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0so when it says (2,7) is on the number line does that mean it's a constant?

Zale101
 one year ago
Best ResponseYou've already chosen the best response.0But when you have a slope and the yintercept (m and b) then the line changes position or shifts from y=x.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0So can you tell me how to spot the constant?

Zale101
 one year ago
Best ResponseYou've already chosen the best response.0That means that line A passes through this point (2,7) as well as many many other points. But this point can locate where the line is. You can think of it as a pin point on the graph and you can draw a line that passes through it. Of course, you can't draw a line from nowhere, you have to be given an info about the slope so we can understand what is the steepness of the line, does it have any or it does not. But it has, and the slope is already given to you. It is 5/3.

Zale101
 one year ago
Best ResponseYou've already chosen the best response.0The only constants are the slope (m) and the yintercept (b). A point is not a constant on the equation because (x,y) keeps changing. (2,7) is just a point that we are giving the info of that the line passes through.

Zale101
 one year ago
Best ResponseYou've already chosen the best response.0Makes sense? Can we do some math now?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0oh okay so do we use (2,7) to find the constant?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0oh okay and 7 is the b intercept right?

Zale101
 one year ago
Best ResponseYou've already chosen the best response.0Nopes. 7 is a yvalue that the pin point is located on. (2,7) where x=2 and y=7 is just a pin point ion the graph that gives us a sense where the line is positioned.

Zale101
 one year ago
Best ResponseYou've already chosen the best response.0Don't think of yinterpret as any yvalue it is a yvalue where the line crosses the yintercept. A yintercept will always have x as 0. If (2,7) was (0,7) then (0,7) would be the yintercept. An example of yintercept i'm going to show on a made up line.dw:1439229765311:dw

Zale101
 one year ago
Best ResponseYou've already chosen the best response.0Good. Can you construct the equation now?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0dw:1439229923659:dw

Zale101
 one year ago
Best ResponseYou've already chosen the best response.0dw:1439230074071:dwdw:1439230059277:dw

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0oh okay so use the 2

Zale101
 one year ago
Best ResponseYou've already chosen the best response.0y=mx+b there's an x and a y in this formula. We can't just discard the x like that. We have to use the point (2,7) and plug in for x and y in here. Also, we can't discard the 2 in (2,7) :)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0dw:1439230149474:dw

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0so whats the next step?

Zale101
 one year ago
Best ResponseYou've already chosen the best response.0Now, we have the two constants m=5/3 and b=31/3 So, y=mx+b the equation is y=(5/3)+31/3dw:1439231431455:dw

Zale101
 one year ago
Best ResponseYou've already chosen the best response.0The next step is to find the xintercept. How would you do that?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0it's suppoed to be 5/3(2) not positive 2

Zale101
 one year ago
Best ResponseYou've already chosen the best response.0Correct. when you said "so when it says (2,7) is on the number line does that mean it's a constant?" i thought it was (2,7), i didn't go back and check what it was originally.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0how come this works?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0dw:1439231685078:dw

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0dw:1439231764295:dw

Zale101
 one year ago
Best ResponseYou've already chosen the best response.0dw:1439231837457:dwdw:1439231907266:dwdw:1439231951916:dwdw:1439232046132:dw

Zale101
 one year ago
Best ResponseYou've already chosen the best response.0pardon my mouse handwriting

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0it's ok i get it now thanks you
Ask your own question
Sign UpFind more explanations on OpenStudy
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.