y = -7/9x - 7
They do not have the same m. They won't be parallel. Now check for perpendicularity.
The first has a slope of 7/9. That means the next has to have a slope of the negative reciprocal of the first. So, is -7/9 the negative reciprocal of the first? No. It is negative, but the reciprocal would be 1 / (7/9) = 9/7
That should be enough so you can clear the rest without me explaining them. I'll just put the answers down:
the ratio of the perimeters is equal to the scale.
the ratio of the areas is equal to the square of the scale.
34 / 20 = k
a / 19.6 = k²
a / 19.6 = (34 / 20)²
a = 19.6 (34 / 20)²
a ≈ 56.6