book Maths Puzzle Numerical Ability

What is the answer to -7u=20
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1. 6 = 2y - y + 4
2. -23 + 8 + x = -2 + 13
Graph this system of inequalities. Name the coordinates of the verics of the feasible region. Find the maximum and minimum values of the given function.

y >= 2
1 =< x =< 5
y =< x + 3
f(x,y) = 3x-2y