Answer:

Explanation:
To find the equation, you have to know the equation 'format' which is

mx is the slope
b is the y-intercept
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:
y = -1x + 1 which can also be written as y = -x + 1