How do you graph $x + y < - 1$ $x+y<-1$ ?

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Answer 1 · 2018-03-29T13:54:56

graph{x+y<-1 [-4,4, -2, 2]}

$x + y < - 1$ $x+y<-1$ can be rewrited: $y < - 1 - x$ $y<-1-x$

Now you can draw $y = - 1 - x$ $y=-1-x$ , using:

$x = 0, y = - 1 - 0 = - 1$ $x=0, y=-1-0=-1$
$x = 1, y = - 1 - 1 = 0$ $x=1, y=-1-1=0$

graph{x+y=-1 [-4,4, -2, 2]}

and exclude the line and the upper region because $(0, 0)$ $(0,0)$ is out of the inequation. Then

graph{x+y<-1 [-4,4, -2, 2]} graph{x+y<-1 [-4,4, -2, 2]}

How do you graph x+y<-1x+y<−1x+y<-1?