exam Maths Puzzle Numerical Ability

I am trying to find the measure of an angle whose supplement is 4 times the measure of its complement. I am so confused. Please help me!

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exam Other Question

find the value of "a" and "b" so that the system of the of equation
2x+3y+5z=9
7x+3y-2z=8
2x+3y+az=b has
1)no solution
2)a unique solution
3)an infinite number of solution Sketch the graph of the soulution set of the system of inequalities.

{ -3 < x < 2
y <0}