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Let x = the larger number
Let y = the smaller number
>>...the difference of two numbers is 49...<
That says the same as
The larger minus the smaller equals 49, or
x - y = 49
So the first equation is x - y = 49
>>...The larger number is 3 less than 5 times the smaller number...<<
Replace "the larger number" by x and "the smaller number" by y
>>...x is 3 less than 5 times y...<<
Replace "is" by "=" and "5 times y" by "5y"
>>...x = 3 less than 5y...<<
That means to make 5y less by subtracting 3 from it:
>>...x = 5y - 3...<<
So the answer is b.
Edwin