Question 117750
Simply use the definition: Since 5 § b = 15, this means 5+5b=15 (just plug in a=5 into {{{a + ab}}}). Now let's solve for b:





{{{5+5b=15}}} Start with the given equation




{{{5b=15-5}}}Subtract 5 from both sides



{{{5b=10}}} Combine like terms on the right side



{{{b=(10)/(5)}}} Divide both sides by 5 to isolate b




{{{b=2}}} Divide


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Answer:

So our answer is {{{b=2}}} 


So when b=2, 5 § b = 15 is true