Thats uhm hard how u do that
Answer:
The y-intercept would be 7
The slope would be -1 or -1/1. They are both the same thing.
The slope is the number which is located directly to the left of the variable (the variable in this case is x, but in other situations it could be a totally different letter).

The given pair of angles are vertical opposite angle pair so, they are equal. i.e