David W. answered • 09/03/16
Tutor
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Experienced Prof
The LCD of fractions is the LCM of the denominators.
15a has prime factors: a*3*5
35 has prime factors: 5*7
The LCM is: a*3*5*7 = 105a [both 15a and 35 are factors of it]
That makes the fractions:
y / (15a) y/35
7ay/105a 3ay/105a [note: this makes adding fractions easy]
