exam Maths Puzzle Numerical Ability

Solve by graphing.
2x+y=-4
y=2

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exam Other Question

(x-4)/2 -1/5 = (7x +1)/20 So there are my 2 problems
1) f(x)=sqrt(-x)
2)f(x)=ln(-x)
i tried doing them in the calculator (ti83+) but no luck