book Maths Puzzle Numerical Ability

{{{1.4x^2+4.9x+2.6=0}}}

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I am sorry but the answer you gave me did not help at all. I need to know how to get these answers (-3,5) ,(-5,-5), (2,0) when i work these problems 1x+1y=2,
-5x+1y=20 and -5/-7x+ What is the square root of x^2+y^2