exam Maths Puzzle Numerical Ability

I had a question similar to this one earlier. This one is of a different format though. If Given A5= -5 and A9=10 find d and A1

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exam Other Question

Solve the following systems by addition. If a unique solution does not exist, state whether the system is inconsistent or dependent.

x + 5y = 10
-2x - 10y = -20 7+13(x+1)<3x