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by ntquigley » Sat Apr 30, 2016 5:07 pm
Can someone please explain to me the "therefore" part, below? In both "therefore" cases, I see three unknowns and only two equations. How can w=y and x=z ??

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by MartyMurray » Sat Apr 30, 2016 8:04 pm
ntquigley wrote:Can someone please explain to me the "therefore" part, below? In both "therefore" cases, I see three unknowns and only two equations. How can w=y and x=z ??
w + x = 90
x + y = 90

Since both equal 90, set them equal to each other.

w + x = x + y

Subtract x from both sides.

w = y

I suspect that you can do the other one yourself now.
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