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January 12th, 2016, 03:46 PM   #1
Joined: Mar 2015
From: KY

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Cross Products

My sons algebra class again... Any help in solving the problems is greatly appreciated.

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January 12th, 2016, 04:21 PM   #2
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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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