Complete the two column proof. Given: x/6 + 2 = 15. Prove: x = 78.
x/6 + 2 = 15 a.______
x/6 = 13 b.______
x = 78 c.______
I know a. is given but am blanking out on what theorems b. and c. would be...I will give you a medal if you show me how, thx.

Question

Complete the two column proof.  Given: x/6 + 2 = 15.  Prove: x = 78.  
x/6 + 2 = 15  a.______
x/6 = 13  b.______
x = 78  c.______
I know a. is given but am blanking out on what theorems b. and c. would be...I will give you a medal if you show me how, thx.

solomonzelman · Answer

What did you do in step a, to obtain the equation in b?

anonymous · Answer

I subtracted two from each side

anonymous · Answer

@SolomonZelman

anonymous · Answer

sorry my computer is being slow

anonymous · Answer

@jtug6 are you there?

solomonzelman · Answer

So, if you subtracted, I would call it a Subtraction, if I recall these proofs correctly.

anonymous · Answer

So its just subtraction, not subtraction property of congruence or something wierd?

anonymous · Answer

and what about c.?