book Maths Puzzle Numerical Ability

given that angle ABD=2y and angle DBC=6y-2, find angle DBC

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I need help solving

3x + 1 < -2 or 2x + 3 > 5
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I think it is something like:

3x + 1 -1 < -2 - 1 or 2x + 3 - 3 > 5 - 3
- If a system of nonlinear equations contains one equation whose graph is a circle and another equation whose graph is a line, can the system have exactly one solution? If so, describe the graph of this situation...