exam Maths Puzzle Numerical Ability

solve by completing the square 2m^2-m-15=0?

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exam Other Question

the slope of the line perpendicular to x+3y=5

a)-1
b)3
c)-1/3
d)1/3
e)1
THIS DOES NOT MAKE SENSE TO ME, CAN I GET HELP ON THIS ONE?

SOLVE THE FOLLOWING SYSTEM OF LINEAR INEQUALITIES BY GRAPHING.

X - 3Y >6
3X + 2Y >12