iso contribution line

Q104 of Kaplan Kit is as follows: An organisation is experiencing a shortage of resources and has graphed a potential linear programming solution which shows its first product, televisions, on the horizontal axis and its other product, tablet computers, on the vertical axis. The iso-contribution line to solve the linear programme is very flat and downward sloping. Which of the following statements is likely to be true for the company? A The contribution per unit for tablet computers must be higher than that for televisions B The contribution per unit for televisions must be higher than that for tablet computers C The contribution per unit for each type of product is very similar D The contribution per unit for one of the products must be negative sir my doubt in this is that, for it to be flat, the horizontal value has to be a higher one and the vertical has to be a lower value right? so why is it the other way? please correct me