The length of DE is 3 bc they are dilated at a ratio of 1 : 1.5
You plug -x+16 in for y in x+4y=37 to get x after you multiply x+4y=37 by -1.
-x-4(-x+16)=-37
-x+4x-64=-37
3x-64=-37
3x=27
x=9
Then you plug 9 into either equation to get y.
y=-x+16
y=-(9)+16
y=7
x=9 and y=7
Answer:
-15
Step-by-step explanation:
9-(9-1*3)
9-8*3
9-24
-15
The answer is 
Steps: (<em>in the attachment</em>)↓↓↓↓↓
<em>Hope this helps!!</em>