HELP !! Are these triangles similar?

Robin spent 25% more time on his research project than he had planned he’s been an extra h ours on the project which of the following expressions could represent the number of hours rob actually spent on the project

X= 3y - 6 2x - 4y = 8 solve the system of equations using substitution. a) (-12,-2) b) (15,7) c) (21,9) d) (24,10)

A. 530 ft^2 b. 500 ft^2 c. 470 ft^2 d. 450 ft^2