exam Maths Puzzle Numerical Ability

This problem is from a worksheet and I need to see if I am doing this correctly

Solve the system by carefully writing and solving a matrix equation. Use teh Causs-Jordan method to find A^-1 if it exist

-2x+3y=-1
3x-4y=5

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exam Other Question
i dont get how to solve :y=x-3 Technology. Driving down a mountain, Tom finds that he has descended 1800 feet in elevation by the time he is 3.25 miles horizontally away from the top of the mountain. Find the slope of his descent to the nearest hundredth.