book Maths Puzzle Numerical Ability

solve by the elimination
2r-5s=-18
5r+2s=42

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book Other Question
the radius r of a sphere is increasing at a rate of 2 inches per minute. find the rate of change of the volume when r=6 inches and dr/dt=24 inches. Please verify my answer is correct for this system of inequalities:

x<-2
y&#8805;3/5x-3
y&#8805;-7
x>-8

After grphing my points of intersection wwere (-4, -2) and (-7, -8)