You can put this solution on YOUR website!
Your slope is -1 therefore the line will go "downhill"
Your Y intercept is 1.
Plot your first point on the Y axis at the 1 spot.
Now use rise over run and go "DOWN HILL" down one, over one.
When you look at it from left to right, it should go downhill.
Remember, if the number before the X is negative, it HAS to go downhill.