exam Maths Puzzle Numerical Ability

Solve these simultaneous equations using a algebric method

3x+7y=18
x+2y=5
x= y=

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exam Other Question

Graph the Solution for these inequality equations:

2x >= y-1 AND 2x-5y<=10

I cannot firgure out what to do.. what I have done so far is

2x >= y-1
-1+2x>=y-1+-1 (which THE PERIMETER OF A POOL IS 30 FT. IT IS TWICE AS LONG AS IT IS WIDE. WHAT IS THE LENGTH OF THE POOL.