Answer:
b = 63/8 or 7 7/8
Step-by-step explanation:
a varies directly as b
a = kb where k is the constant
if a = 8 and b = 3
a = kb
8 = k ( 3 )
k = 8 / 3
k = 8 / 3 or 2 2/3
if a = 21, what is b?
21 = ( 8/3 ) b
b = 21 / ( 8/3 ) ; find the reciprocal of the divisor and change the operation from division to multiplication.
b = 21 * ( 3/8 )
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Answer:
b = 63/8 or 7 7/8
Step-by-step explanation:
a varies directly as b
a = kb where k is the constant
if a = 8 and b = 3
a = kb
8 = k ( 3 )
k = 8 / 3
k = 8 / 3 or 2 2/3
if a = 21, what is b?
a = kb
21 = ( 8/3 ) b
b = 21 / ( 8/3 ) ; find the reciprocal of the divisor and change the operation from division to multiplication.
b = 21 * ( 3/8 )
b = 63/8 or 7 7/8