You are Here: Home >< Maths

# I need a maths guy-girl. Please. (A level y=mx+c stuff)

Announcements Posted on
TSR's new app is coming! Sign up here to try it first >> 17-10-2016
1. hey. thanks for clicking on this thread.

how do I answer the following question: what is the equation of the line through the points (3,7) and (9,4)

TSR are usually great with answering maths questions, it would be great to find an easy to understand solution on here.

Thank you!
2. Find the gradient by getting the difference in y / the difference in x.From here using the equation y-y1 = m(x-x1) we can sub the gradient and a point on the line to get the equation of the line.
3. There are two components to figuring out the equation of a line: firstly, the gradient (which can be figured out using a simple formula), and the y-intercept (which can be figured out after we find the gradient)

There are two components to figuring out the equation of a line: firstly, the gradient (which can be figured out using a simple formula), and the y-intercept (which can be figured out after we find the gradient)

I'm confused.
5. (Original post by Alexion)
I think you mean gcse y=mx+c stuff
reported for being mean
6. (Original post by citibankrec)
reported for being mean
just stating a fact
7. once you have found an equation you should test it by putting in an x value & seeing if the y value which comes out is correct.
8. (Original post by ZiggyStarDust_)
hey. thanks for clicking on this thread.

how do I answer the following question: what is the equation of the line through the points (3,7) and (9,4)

TSR are usually great with answering maths questions, it would be great to find an easy to understand solution on here.

Thank you!
Okie. Draw it out in a graph, and find the gradient. You can make it into a triangle to find the m (the gradient). So for every one that it goes across, how much it goes upwards. Then you can find the y-intercept which is c. I wont give you the answer or you wont learn, but any questions, gimmie a shout .

I suck at teaching sorry. Just started a-level so kms
9. (Original post by ZiggyStarDust_)
hey. thanks for clicking on this thread.

how do I answer the following question: what is the equation of the line through the points (3,7) and (9,4)

TSR are usually great with answering maths questions, it would be great to find an easy to understand solution on here.

Thank you!
so take your y and x values:

gradient = 7-4 divided by 3-9
so 3/-6
which can be simplified to 1/-2 or simply -1/2 or -0.5

then substitute one of the points into the equation for a line.

y-7= -0.5(x-3).
y-7= -0.5x - 1.5
y= -0.5x + 5.5
10. (Original post by ZiggyStarDust_)
I'm confused.
I've explained it in quite a simple way. Perhaps flicking through a textbook would be more beneficial than going through examples - it's pointless if we're effectively teaching you new material.
11. (Original post by Emilia28)
so take your y and x values:

gradient = 7-4 divided by 3-9
so 3/-6
which can be simplified to 1/-2 or simply -1/2 or -0.5

then substitute one of the points into the equation for a line.

y-7= -0.5(x-3).
y-7= -0.5x - 1.5
y= -0.5x + 5.5
THIS IS ALL I WANTED

thank you very, very much. Thank you.
12. (Original post by ZiggyStarDust_)
THIS IS ALL I WANTED

thank you very, very much. Thank you.
Not sure what the issue was, I gave you a step by step answer as the first answer here but you wanted someone to spoonfeed you the answer? Should've made it more obvious.

## Register

Thanks for posting! You just need to create an account in order to submit the post
1. this can't be left blank
2. this can't be left blank
3. this can't be left blank

6 characters or longer with both numbers and letters is safer

4. this can't be left empty
1. Oops, you need to agree to our Ts&Cs to register

Updated: October 7, 2016
TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Today on TSR

### How does exam reform affect you?

From GCSE to A level, it's all changing

Poll
Useful resources

### Maths Forum posting guidelines

Not sure where to post? Read here first

### How to use LaTex

Writing equations the easy way

### Study habits of A* students

Top tips from students who have already aced their exams