Question 103096
f(x) = –x – 2.
A function is just a formula where you put a number in and get a number out. Let's generate some values. 
For x=0, f(0)= -0-2=-2
For x=1, f(1)= -1-2=-3
For x=2, f(1)= -2-2=-4
Let's do some negative values too.
For x=-1, f(1)= -(-1)-2=-1
For x=-2, f(1)= -(-2)-2=0
Now we have pairs of points (x,y) that describe this function. A grid define the x axis as the horizontal axis and y axis as vertical axis. Plot points on the grid to make your graph. 
Let point A be (0,-2)
{{{drawing( 300, 300, -5, 5, -5, 5,grid( 1 ),circle( 0, -2, .2 ),locate( .
75, -1.2,A  ), circle( 1, -3, .2),circle( 2, -4, .2 ),circle( -1, -1, .2 ),circle( -2, 0, .2 ))}}}
Then draw a line to connect all the points. Actually your function would continue in a straight line to the edges of your graph paper. 
{{{drawing( 300, 300, -5, 5, -5, 5,grid( 1 ),circle( 0, -2, .2 ),circle( 1, -3, .2),circle( 2, -4, .2 ),circle( -1, -1, .2 ),circle( -2, 0, .2 ),line(-5,3,5,-7))}}}