exam Maths Puzzle Numerical Ability

Any help will be appreciated with the following.

Find the slope and the intercepts of each line.

g(x)=54x-1

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exam Other Question

5x-8=2x+7 log(x) + log(2x) = 10

Im really confused on this question. Ive been trying this:

log(x(2x))=10
log(2x-x^2)=10

but after that im not sure what to do next. Any help would be great. Thank you!!