Systems of Linear Inequalities

Systems of Linear Inequalities

[dhruvshahane]

There is an error present in the video. When writing out the second inequality, the y-intercept is wrong and therefore, it should be 3/2.

[jenniferangeles]

I showed this video in class and we found an error. The part when you divided the second equation by 4. You forgot to divide 6 by 4. I had to correct it in class and explain it to my students. On the brighter side of this experience, I realized that my students understand the lesson because they easily identified the error in the video, which means they dont just watch it but they are really paying attention to the process.

[mitchreed]

it’s funny how this video explains more than my algebra teacher

[damarisbishop]

sorry if this sounds like a dumb question but how do you get 6/4 to equal 6? ahhh i see I' am not the only one asking this question

[puertodeluna]

I was glad to see that others noticed the error in the y-intercept. I'm a teacher too and it is common to make errors while writing on the white board. I rely on my students to help me out and point out my mistakes.

[blainevideos]

When simplifying the second inequality, you accidentally lost the denominator in 6/4. It can't just disappear. What you wanted to do was to keep 6/4 and then simplify it to 3/2 (or 1½). Thus the reference line should have started with the y-intercept of 3/2 (1½) and then had a slope of -1/4 from there. And to Matthew Herzeca, you absolutely *can* have an intercept that is a fraction.

[hey_its_mika]

hey guys on who are watching this on sunday

[lukealucard]

Thank you so much. Also I think you made a mistake solving the second inequality. The y- intercept is equal to 6/4.

[spxncxrtxrry]

Thanks man you are better than any teacher I have ever had

[kate]

im taking two highschool classes early while doing 8th grade at the same time and my math eoc is next week. this helped so much!

[twary]

WOW thank you the shading part our teacher taught us was so fucking confusing, you just saved my life

[shine]

I understood this better than what my teacher was teaching for 2 weeks. Thank you

[Engineer]

why would u ever dislike mr 58 he's doing great

[nightsky]

I suggest using the rise over run term when graphing, it helps you remember

[heyemilywalker]

watching this on sunday at 11pm because test is Monday morning at 7:30

[popmuzic]

....I like the purple. And the fact this is saving my grade.

[ahmedalgammal]

Ur the best khan academy thank you so much

[ottoharcrow]

This was a huge help! Thank you! By the way, Sal Khan made a simple error and we all know what the real answer is and how to do it so stop complaining.

[DaniS]

In the second example, why is the y intercept 6, instead of 6/4 or 3/2? Both sides had to be divided by four, so that should make 6 become 6 over 4, right?

[SVKteacher]

To all students, yes the y-intercept should be 6/4 (reduced to 3/2 or 1.5) for the second inequality. Other than that, his process is totally right.