exam Maths Puzzle Numerical Ability

x=-4y+4
5x-3y=-3 solve the system by the substitution method

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exam Other Question

At 3pm a plane leaves London to fly to Madrid which is 1260 miles away. At 4PM a plane leaves Madrid to fly to London. The second plane flies 40 MPH faster than the first plane. If the planes pass one another at 4:30pm, what is the speed of each plane? Plot the graphs of the following functions. Submit the graphs to the dropbox along with your response.
f(x)= log2x
Please help me understand what I should be doing.