exam Maths Puzzle Numerical Ability

1) Give the three equtions that would find the temperatures at x1, x2, x3 shown in the figure below, if the temperature of each interior point is the average of its four neighborin

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Please help setting up formula:

Joey works in the summer at a lake. His boss pays him $24 each day that he takes a fishing party out plus his board. On the days he doesn't tak (7x2+x+1)-(3x2-4x-3)