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I can't seem to get this expression written correctly

Algebra
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two hours into an experiment and the liquid temperature is -17 degrees celsius. after eight hours the temperature is -47 degrees celsius. I need to write two expressions for the equation. I have x for the hours and now need to write for the degrees 

Nov 3rd, 2014

a+2x= -17

a+8x =-47

6x =-30

x= -30/6=-5

a=-17-2*(-5) =-17+10=-7

Expression is -7-5x

Nov 3rd, 2014

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Nov 3rd, 2014
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Nov 3rd, 2014
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