book Maths Puzzle Numerical Ability

how is y=5x+6 similar to -18x+3y=-54

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It takes Jim 6 hours longer to fly the 1125 miles from Montreal, Canada to Birmingham, Alabama, in his Piper Cub than it does in his jet. If his average speed in the jet is 3 times that in the Piper Cub, What is the average speed of the Piper Cub? __mph What is the formula for compound interest? Need to find out how much someone will make if invest $1000 per year for 37 years at 12% interest per year?