exam Maths Puzzle Numerical Ability

How does the solution set for a linear equality differ from a linear inequality over a given region of 2-dimensional space?

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exam Other Question

I do not understand how to solve this, please help.
Solve the following system by addition. If a unique solution does not exist, state whether the system is inconsistent or dependent.
x + 5y = 10 and -2x - 10y = -20 Solve 3z-2/-5<6