exam Maths Puzzle Numerical Ability

What is the image of x^2+y^2=1 under the mapping rule (x,y)---(3x+2,3y-5)?? I think the answer is 1/3(x-2)^2,3y-5). Can someone PLEASE help me ??

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exam Other Question

1/2log2+2log1/2 If C= the cost of a gallon if gasahol, g= price per gallon of gasoline, a= price per gallon if alcohol, and p% is the percent of gasoline, write a formula for the cost, C, of gasahol.

Thank you for the help I am starting to understand this stuff.