SOLUTION: how do i graph x + y = -2

Algebra ->  Graphs -> SOLUTION: how do i graph x + y = -2       Log On


   

Question 1167144: how do i graph x + y = -2

Answer by math_helper(2461) About Me  (Show Source):
You can put this solution on YOUR website!
Start by solving for y:
x + y = -2

Subtract x from both sides:
y = -x - 2

Draw coordinate axes: by convention, the x-axis is the horizontal axis, and the y-axis is the vertical axis.
+drawing%28400%2C400%2C-10%2C10%2C-10%2C10%2C+grid%281%29%29+

Now pick a value of x and calculate y. For the value of x chosen, move right or left to that x value along the x-axis. Then move up or down parallel to the y-axis and place a dot at the (x,y) coordinate. Since this equation is for a straight line, you can plot two points in this way and then draw a straight line through them. You can (and should) verify that any point on such line also obeys y=-x-2.