exam Maths Puzzle Numerical Ability

Find the slope of the line 3y+8=0

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exam Other Question

The function f(x)=700(.5) x/90 models the amount in pounds of a particular radioactive material stored, where x is the number of years since the material was stored. Find the amou 2x-5y+z=5
3x+3y-z=17
4x-3y+2z=17