book Maths Puzzle Numerical Ability

can you please really help me with this question.. it will really help me alot..
solve by any method.
-2x+10=0
2x-2y=6

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book Other Question

I am working on finding distance. However, I cannot figure out how to get an approximate answer from a square root on the calculator. Example:

square root 19 + 2 square root 35 X^2-5X+3=0