Question

The answer to 11 is perpendicular and the answer to 12 is parallel but I want to know how to get to that answer​

Answer 1

11.

10x+4y=-4 as y=Mx+b. y=−5/2x−1

8x-20y=60 as y=Mx+b. y=2/5x−3

12.

x-y=9 y=x-9

7x+7y=35. Y=-x+5

Explanation: