exam Maths Puzzle Numerical Ability

i need a step by step example of a linear programming problem! please send me one. ex)

3x-y<7
2x-y>3
y>x-3

f(x,y)=x-4y

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Hi plz could you help me wiv this question..... factorise: (p+q)^2+5(p+q)
it would be a great help! thnk you! oh n the 2 out side the brackets is a squared sign thnx! A thermometer reading 79 degrees F is brought into a cold storage room with a constant temp of 38 deg F. if the thermometer reads 70 deg F in 6 mins. How long will it take to reach