For this case we have that by definition, the equation of a line of the slope-intersection form is given by:
![y = mx + b](https://img.qammunity.org/2020/formulas/mathematics/high-school/fc4cgm6covys37zv2opmmp9ps4jxyjepvh.png)
Where:
m: It's the slope
b: It is the cut-off point with the y axis
We have to, if two lines are parallel then their slopes are equal.
If we have
with slope
, then a parallel line will have slope
![m_ {2} = - 1.](https://img.qammunity.org/2020/formulas/mathematics/middle-school/20fip02coeqq0wt74d2ebl50k3xu0xrvh3.png)
Thus, the equation of the parallel line is of the form:
![y = -x + b](https://img.qammunity.org/2020/formulas/mathematics/middle-school/mc8lib3aoq0y2uu6e9bex0j24e5ns9duig.png)
We substitute the given point and find "b":
![-2 = - (2) + b\\-2 = -2 + b\\-2 + 2 = b\\b = 0](https://img.qammunity.org/2020/formulas/mathematics/middle-school/8oj70r3iuxn3jaosjyntecgtzrglirsy73.png)
Finally, the equation is:
![y = -x](https://img.qammunity.org/2020/formulas/mathematics/middle-school/aoia7nrikcbzgqkx95sa98tn4f0wqg926g.png)
Answer:
![y = -x](https://img.qammunity.org/2020/formulas/mathematics/middle-school/aoia7nrikcbzgqkx95sa98tn4f0wqg926g.png)