Answer:
79
Step-by-step explanation:
Let the original number be x.
x/2 = 39.5
x = 39.5 × 2
x = 79
y=68
54=y−14
54+14=y
68=y
(x,y) = (-219/9, -818/9)
2(-2)-5(-2)+12
-4-(-10)+12
6+12
18