book Maths Puzzle Numerical Ability

can someone TEACH me how to find a boundry of a line??????(step by step)

for example--- Y>/ x+3

y>/ -x+1

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book Other Question

Find values of c so that the equation will have two solutions, one solution, and no real solution.

x^2+4x+c=0 Pump A can fill a tank in 6 hours. Pump A and B together can fill the same tank in 3.5 hours. How long will it take to pump B to fill the tank alone? Can you show me how to do this problem? Thank you.