i need to graph x+y+4=0

Question

I need to graph x+y+4=0

Answer 1

x+y+4=0

 

first isolate y

subtract x and 4 from both sides

 

y=-x-4

 

the -4 is the y-intercept and tells you where the graph crosses the y-axis (coordinate (0,-4))

 

the graph has a slope of -1 since there is a -1 in front of the x: this means you go up 1 unit and over to the left 1 unit, or go down 1 unit and go to the right one unit. Your initial point is (0,-4)

Answer 2

You may or may not want to find the equation of the line in slope-intercept form or other forms ..

 

In order to plot the line, you need two points.  Why?  Two points are enough to determine a line.

 

  x  +y + 4 = 0    is the equation of the line

  0   -4 + 4 = 0              (x,y) of (0,-4) is on the line

 -4 + 0 + 4 = 0               (-4,0) is also on the line

 

When selecting points, you get your choice.  Most people like "easy."