So what you asked this is what I got
x(y) = 4.5
If x= 0.5 then
0.5(y) = 4.5
y=9
x(y) = 4.5
10(y) = 4.5
y= 0.45
hope this helps :)
Im pretty sure your answer would be D, 6x
but tell me if im wrong.
Answer:

Step-by-step explanation:
x=unknown number




simplify the fraction so... -7/2
C. The area is increased by an area of 25
8x7=56
40x35=1400
1400/56=25