If I understand the question correctly, 3:4 and 12:16 are equivalent ratios.
Answer: y = 0.5x -1 and t = 0.5n + 1
Y(7, -8) so x=7 and y= -8 initially
Y’( x+3, y-4)
Y’(7+3, -8-4)
Y’(10, -12) after transformation
Answer: y=6
Explanation: If you put the equation y=6 into graph form (as seen in the picture below) you will have a horizontal line that goes through the point (9,6)
(P.S the black dot represents the point (9,6))