Answer:

Step-by-step explanation:
To find the equation, you have to know the equation 'format' which is 
<u>mx is the slope</u>
<u>b is the y-intercept</u>
The slope is -1 because it goes down 1 and right 1 
The y-intercept is 1 because that is where the line touches the y-axis.
So, if we plug it in, it will look like:
<em><u>y = -1x + 1</u></em> which can also be written as <em><u>y = -x + 1</u></em>