exam Maths Puzzle Numerical Ability

Sorry, but I have one more question on the substitution method. It is a+b=5000 and 0.08a=0.06b-20 THANKS ALOT

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exam Other Question

This deals with radical exponents;exponential & logarithmic functions.
The problem is to simplify each expression. All variables represent positive real numbers.
4cube root sqrt2 Two lines have slopes 2k-4 and k+6. What value(s) of k will produce perpendicular lines? I think the answer is k=-4+or- sqrt66/2????????