book Maths Puzzle Numerical Ability

If the Richter magnitude formula is R=0.671 Log(0.37E)+1.46. R= Magnitude and E= the energy in kilowatt-hours. What is the magnitude of 5.02x10^8 kwh of energy?

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How do you simplify this fraction? 15c-5c squared over 3c-c squared. Hi, im Very confused on Linear Graphs anything to do with it.
First here is a problem the i have that i cannot understand at all
{2x+y=-3
{ y= 7
and it says "use substitution to solve the problem"