exam Maths Puzzle Numerical Ability

I need help please.
Solve by substitution.

5x-2y=-5
y-5x=3

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exam Other Question

on chapter one page 43 44 - 60 i dont under stand the whole order of operation and how you divide the numbers like number 44 which i really cant explain if you can help me that Copy and complete the statement using <,>, or =.

33.4^6 ___ 4^3 x 4^3

Any help with this problem would be GREATLY</b> appreciated