On a number line, a number, b, is located the same distance from 0 as another number, a, but in the opposite direction. The number b varies directly with the number a. For example b = 2 3/4 when a = –2 3/4. Which equation represents this direct variation between a and b?
A.) b = –a
B.) –b = –a
C.) b – a = 0
D.) b(–a) = 0

Question

On a number line, a number, b, is located the same distance from 0 as another number, a, but in the opposite direction. The number b varies directly with the number a. For example b = 2 3/4 when a = –2 3/4. Which equation represents this direct variation between a and b? 
A.) b = –a
B.) –b = –a
C.) b – a = 0
D.) b(–a) = 0

anonymous · Answer

@johnnemeth151

melissa_something · Answer

This is easy. We can cross out c and d because it's useless. B is the -a so it MUST be A.