Nach0 wrote:

Here's a couple more examples:

5x-7y<-4

Attachment:

3.gif

+5x: No reversing/reversing/"oppositing"

-7y: Positive slope

<: shade to the left of the line

-4: X-intercept is negative (to the left of the origin)

-3x-6y<-9

Attachment:

4.gif

-3x: Everything will be reversed!

-6y: Positive slope, but since there's a -3x, it will be negative

<: Supposed to mean shade to the left, but it's right this time because of the -3x

-9: Like the others, generally means negative x-intercept. It will be positive because of the -3x

haha .. Thats a pretty long approach man ..

1. 5x-7y<-4, use origin as reference and put x=y=0.. it comes 0<-4 which is not true hence shade the portion which does not contain origin .. why bother yourself with so many things :p

2. -3x-6y<-9 , origin as reference, 0<-4 .. not true .. shade the portion which doesnt contain origin ..

results are same as yours ..

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