GCSE Maths - How to Write Algebraic Expressions for Directly Proportional Relationships #90

This video covers:
- What direct proportion or directly proportional means
- How to write expressions for directly proportional relationships

This video is suitable for maths courses around the world.
KS3 - All on your course
GCSE Foundation - All on your course
GCSE Higher - All on your course
A-level - Not on your course

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[Cognitoedu]

If you’d like to practise the material covered in this video, check out our platform at www.cognitoedu.org - it's totally free, and has been built to make learning and revision as easy as possible. The main features are:
- Lessons organised by topic, only the lessons relevant to your specific exam board and tier are shown.
- Automatic progress tracking. Progress bars tell you what you’re doing well at, and what you need to spend some time on.
- Practise quizzes so you can test your knowledge. You can quiz yourself on any combination of topics you like.
- A huge number of fully-hinted questions that take you step-by-step through some of the trickiest calculations & concepts.
- A comprehensive bank of past exam papers, organised both by year, and also by topic.

Amadeus & Tom

[ksumar]

As a parent teaching my daughter GCSE maths, I find your videos brilliant. I salute you for making these short videos which are clear and concise. Keep it up and be safe my friend. God bless all students taking their GSCE exams, even if its internally assessed by your teachers in 2021 due to lockdown.

[sadhanna-royr]

hi cognito! i really want to say that your videos have helped me understand my subjects better. on days when im confused and need help i always type your channel's name to solve my queries. thank you so much for putting this great amount of effort in your videos. It has a provided a lot of benefits on everyone's academics. all our gratefulness and appreciation will be dedicated to you and your team. rooting for you to get 1 million subscribers too. will be sharing your channel with everyone i know. once again thank you so much

[auxy]

Maths teacher this year is shit, thanks for actually telling me what the constant is 👍

[RA-wlce]

THANK YOU SO MUCH!! this helps a lot more than my teacher !!!! x

[pranomkawa]

Hey, first of all great video, very concise and clear. I was wondering if can you do a video about powers in direct proportion, we are currently learning it in my IB MYP4 class and it is very confusing and hard to understand. I would really appreciate it if you created a video about this.

[oswinlian]

Really thank you for making these videos, I am really looking forward to your new GCSE Maths videos.

[violethill]

sir how do we know which one's to plug in for the x and y values in the direct variation equation "y=kx" if the word problem doesn't state the key phrase "varies directly or proportionally"?

[ryze]

Hi bob here, just wanted to say thanks

[chawasdream]

is there a video about rational graphs

[thedude]

this is so much better than my teacher

[ketrinvalentin]

howzit, why do we add 'k' of the constant of proportionality can't we just add the symbol? would thus be required for IGCSE?

[moirasherif]

Helloo:) I have a question from where did we get 12hr at first part? What does it mean as well ?

[atoz]

Which video editor do you use? Please answer me!! please :)

[brgtygg]

It is sad that he only got 40 k views it’s nothing in YouTube to make money of those videos