exam Maths Puzzle Numerical Ability

please help

Use substitution to solve for x and y

4x + y = -5

2x - y = -1

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exam Other Question

2[18-(5+3^2)/7]
we are doing the (pemdas) i'm not sure what to start with first do idivide or mulitply first Can someone help me on this?

I need to add: Write the answer in the lowest term"
5/9 + 8/9 is it:
(A) 13/18
(B) 1 1/3
(C) 1 4/9
(D) 1 2/3

Thanks,
Lyn