the equation of the line has form
y=kx+b
, so

The second line is parallel to the first and runs 7 units lower, so b=5

D cause Times x by y and your answer should be
Step-by-step explanation:
<A + < B = 90° { being complementary angles)
2x + 10° + 3x + 15° = 90°
5x = 90° - 15° - 10°
5x = 65°
x = 13°
Now
<B = 3x + 15° = 3 *13° + 15° = 54°
Hope it will help :)
I solve this question with further steps which was not so much necessary, but it's correct