Answer:

Step-by-step explanation:
Let
x-------> the length side of the rectangle
y------> the width side of the rectangle
we know that
---> equation A
---> equation B (given problem)
substitute equation B in equation A

so
the coordinate of the top-left vertex of the rectangle is equal to

Answer:
Yep!
Step-by-step explanation:
I'm not 100% sure if your first one is correct, but I know the second one is! Great job :)
Answer:
equivalent ratio for this question is
4:6:48
M∠ADB + m∠BDC = m∠ADC [<span>angle addition postulate]
x + x + 10 = 60
2x + 10 = 60
2x = 60 - 10
2x = 50
x = 50/2
x = 25
a
m</span>∠ADB = x = 25°
b
m∠BDC = x + 10 = 25 + 10 = 35°