Bill's original ratio is like this...
6 to 10
You need to solve for this...
x to 15
You have to multiply both sides of the original ratio by 15...
6 times 15 = 90
10 times 15 = 150
Your new ratio is 90 to 150
Which reduces to 3 to 5
Yout new ratio is 3 to 5
The domain is [-2/3,infinity) U (infinity,-2/3]
point, line, plane............................
-18= you owe 18 dollars
18= you earned 18 dollars
0= you owe nothing/you earned nothing