book Maths Puzzle Numerical Ability

Old Isaac dropped from his perch on Mrs. Cohen's window ledge 25 feet above ground. Teh equation h=16t*2+25 gives Isaac's height above the ground in feet as a function of time, t,

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..../a
.../....
../......
./........
/b____cd____>

ignore the dots, they are filler to line everything up.
a) 5x-20
b) 2x+8
c) blank
d) 6x+ 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