Question 169534:
Answer by maali40(13)   (Show Source):
You can put this solution on YOUR website! x=-2 y=5 z=-3
1. x+y-z (-2 +5 -(-3) )=(2*(-1+1)+3-(-3))=(2(-1+1)+3(1+(-)^2))for all intents here =(3(1+1))=6 no 'division by (1-1)' so arithmetic suffices.
2. 2y-2
----------=(2*5-2)/(-2)=(5-1)/(-1)=(4+(1-1))/(-1) 'here' =-4
x
3. x + 31
---- ----- =-2/5/(-3)+31/30=2/15+31/30=4/30+31/30=35/30=7/6
y*z 30
4. z - y - 12.7=(-3)-(5)-(12.7)=-20.7=-20-7/10=-207/10
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