It looks like you are trying to find the values of a, b, c, d, e, and f in the matrix [-3x+3y] given the matrices X and Y.
To find the values of a, b, c, d, e, and f, you will need to perform matrix multiplication. Here is how you would do this:
[-3x+3y] = [-3X+3Y]
= [-3*[-7 7]+3*[5 1]]
= [-3*[-7 7]+3*[5 1]]
= [-3*[-7 7]+3*[5 1]]
= [-3*[-7 7]+3*[5 1]]
= [-3*[-7 7]+3*[5 1]]
= [[-21 21] [9 -3]]
Therefore, the matrix [-3x+3y] is equal to [[-21 21] [9 -3]].