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 = 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
+2
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Home » Mathematics » 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 = 2b equals 2 and StartFraction 3 Over 4 EndFraction.