book Maths Puzzle Numerical Ability

solve by addtion method 2x-4y=7
4x+2y=9

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Hello and here it goes -----

Find an appropriate viewing window for the equation ( a window that includes all the points relevant to the problem but not large regions that are n Does this quadratic equation have a solution and how do I justify?
1. p2-4p+4=0, 2.m2+m+1=0, 3. 3z2+z-1=0