book Maths Puzzle Numerical Ability

Solve the following system by substitution
8x-4=16
y=2x-4

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I need assistance in solving this

Wrtie as the sum or difference of single logarithms of x, y, and z

log(lowercase)8{(3x 3sqrt y) / z^5}

Note: the 3 is inside the A motorboat goes 5 miles upstream in the same time it requires to go 7 miles downstream. The river flows at 2 miles per hours. What is the speed of the boat in still water?