exam Maths Puzzle Numerical Ability

i dont get how to solve :y=x-3

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exam Other Question

I need the steps for this

Remove the parenthesis by applying the distributive property 20x(3-2x) 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