book Maths Puzzle Numerical Ability

Ok, got another one from homework test problems. Don't know what book it comes from.
The function S(t)=308.7-4.1t can be used to estimate the total Bahamian sales of snow-tires, i

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book Other Question
This question is actually about elimination because there werent any catorgories for elimination. My question is:
4x-2y=-14
3x-y=-8

My answer was (-2 7/10 ,-12 4/10) but I don add the x and y intercepts in 3x+5y=12