book Maths Puzzle Numerical Ability

WERE DO U FIND EVALUATING EXPRESSIONS

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Please Help Me!!!!
I need to find the equation of the line passing through the point
(2,7) with a slope of m=2

A)y=1/2x-3/2
B)y=2x-12
C)y=1/2x+6
D)y=2x+3

Please show your work, so that I can learn how this is done...thanks
A rectangle has an area of 53.3 square feet. If the rectangle is 8.2 in. long, how wide is it?