book Maths Puzzle Numerical Ability

If i was to graph this system of linear inequalities, how will it look on a graph? y≥x and y≥-x/2+1?

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I am unable to solve this problem. Kindly help.

Log10(x+y)/3 = 1/2(log10x + log10y) Now, prove that x/y + y/x = 7 Help!!!

^3(((16a^5)))
_____
b^12

All in square root symbol except fo the 3. The line is under the 16a^5

I hope I explained it ok.