exam Maths Puzzle Numerical Ability

y>3x

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These problems are really giving me some trouble, will someone please help!
If:
tanA=(-2/3) and 90 degrees < A < 180 degrees, find sinA.

Thank you again for your time, Natalie
How do I graph this?
y ≤ -x+18
x ≥ 4
y ≥ 3