book Maths Puzzle Numerical Ability

find the length if a rectanglur lot with a perimeter of 122 meters if the length is 7 meters more than the width.

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book Other Question

can someone solve for T please
T=6.23*10^8/yz if y=3.8*10^4 and z=2.57*10^3
MY ANSWER but i dont think its right T=6.37927503583862 What is the equation of the line whose slope is -45 and passes through the point (-2,3)?