exam Maths Puzzle Numerical Ability

Please help solve 14 + (-1). The answer I got was 13. I just want to make sure that my answer is correct. I am a little rusty on this problem. Thank you for your help.

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The cramer's rule for solution of the problem below:
a1x+b1y+c1z=k1
a2x+b2y+c2z=k2
a3x+b3y+c3z=k3 Hi All,

I need some help with graphs, I have serveral that I did to do and I don't know anything about graphs. Can someone please help me with the following.

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