exam Maths Puzzle Numerical Ability

3x+2y=13
2x+5y=5

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exam Other Question

The cost of producing a number of items x is given by
C = mx + b, in which b is the fixed cost and m is the variable cost (the cost of
producing one more item).
(a) If the fixed I'm just beginning to do proofs. How do I even begin? Please explain a systematic method to set up a proof.