C. Find the values of x and y. Explain how you know. 5. 3 6 -4 X 6 -4 y-1 -9 -12 -9 -3 -7 8 -3 -7 8 6. -9 -17 + = 15 24 7, -4 -9 2 4x-2 -4 -9 2 122 6 -1 5 -11 = 6 -1 5 -11 -1 -5 -90 7 -4y+1 -5 -90 8. ([ -2x 0 ] - [ -9 -y ]) - [ 14 2 ] = [ 3 18 ] 9. -3 -X -2 -21 + = 5 -5y+7 -10 -4y-1