exam Maths Puzzle Numerical Ability

Help Solving expressions:
I did this to solve
5+(2)^2 /(3-1)3

5+4 / 23
which leaves
9/6
I am confused with the PEMDAS.

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exam Other Question

write the slope intercept form for an equation of the line perpendicular to the graph of the given equation and passing through the given point?
5y=-x+1, (2,-5) One number is 3 less than twice another number. If the sum of the numbers is 330, find the two numbers. I cannot figure this out. I always come up 3 short on the answer.