Answer:
![y=-1x+1](https://img.qammunity.org/2021/formulas/mathematics/middle-school/bro2xrgjcyi5fa060g4brhy4mnva48ajmg.png)
Explanation:
To find the equation, you have to know the equation 'format' which is
![y=mx+b](https://img.qammunity.org/2021/formulas/mathematics/middle-school/yj5waqmoy4i54laybzhhshd88hyo5w5rj5.png)
mx is the slope
b is the y-intercept
The slope is -1 because it goes down 1 and right 1
![(rise)/(run)](https://img.qammunity.org/2021/formulas/mathematics/middle-school/3jp5d8vii932j341zjcsxym4by1d4hqy0c.png)
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