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January 12th, 2016, 02:46 PM  #1 
Member Joined: Mar 2015 From: KY Posts: 35 Thanks: 1  Cross Products
My sons algebra class again... Any help in solving the problems is greatly appreciated. 
January 12th, 2016, 03:21 PM  #2 
Math Team Joined: Dec 2013 From: Colombia Posts: 7,356 Thanks: 2469 Math Focus: Mainly analysis and algebra 
b) is incorrect. You are trying to prove the Cross Product property so you can't use it in the proof. You have simply multiplied both sides of the equation by the same number $\displaystyle bd$. d) is the associativity of multiplication. e) multiplies numbers by their multiplicative inverses f) multiplies by the multiplicative identity. For 2) you have $\displaystyle {b \over j}=\frac45$ and $\displaystyle {b +8 \over j+8}=\frac67$ which should be straightforward to solve. 3) is entirely similar, having negative signs in place of the plus signs. 

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