On a number line, a number, b, is located the same distance from 0 as another number, a, but in the opposite direction. The numb
er b varies directly with the number a. For example b = 2b equals 2 and StartFraction 3 Over 4 EndFraction. when a = –2a equals negative 2 and StartFraction 3 Over 4 EndFraction.. Which equation represents this direct variation between a and b? b = –a
–b = –a
b – a = 0
b(–a) = 0
if the distance from origin 0 of b is the same as the distance of a from b but in opposite directions, this makes b differ from a by polarity but with similar values.
