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2014-05-18T13:36:30+03:00
M(1,5)⇒
f(1)=a+b=5⇒a=5-b
N(-3,3)⇒
f(-1)=-3a+b=3⇒-3(5-b)+b=3⇒-15+3b+b=3⇒4b=18⇒b=18/4
a=5-18/4
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