How do you do this problem: ab + c = 5 Solve for c

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To solve for c means to isolate c. By the way, this applies to any variable. Begin by subtracting ab from both sides. ab - ab + c = 5 - ab Of course, ab - ab will cancel out leaving us with c on the left side. c = 5 - ab...This is your answer. THE PROVE: You were given ab + c = 5 Let c = 5 - ab If we get the same answer on both sides, then we know that c = 5 - ab is correct. ab + c = 5 Replace c with 5 - ab ab + 5 - ab = 5 5 = 5...It checks!! So, the right answer is c = 5 - ab