book Maths Puzzle Numerical Ability

tell if lines are parrallel, perpindicular, or neither!
3x-8y=313
x=367/5-8/5y

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book Other Question

I am trying to remember how to do radical algebraic expressions and if you could just give me a sample that would be great an example problem is

150 over (square root sign) 300 and you have to simplify it.

PLEASE HELP What is -5/4 + 1/4 ? How did you get the answer?