exam Maths Puzzle Numerical Ability

Find a slope of a line perpendicular to each given line.
0=3+x
-3y=12x+9

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exam Other Question

Graph the feasible region for each system of inequalities
2x-y<1
3x+y<6 Michelle is eight years older than adam. Three years ago michelle was twice as old as adams was then. How old is Michelle?

-I just need to know how to set it up, very confused on that