book Maths Puzzle Numerical Ability

for what values of x will (x,y) be a solution of the system of the following equations
x2+y2 = 25 both intergers are squared
x+y=1

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book Other Question

SOlve for x

2 / x+1 plus 1 = 9 / x+1

Thank you for your help write each set in interval notation and graph it?

1. .3X+2.1(X-4)_<_-6.6

2. -5X+1_>_11 or 3X+5>26

hint: _>_ or _<_ is greater than or equal to or less than or equal. I