The slope of the line would be 3
There are 6 outcomes
white-Blue-Grey(2 outcomes)
Red-blue-grey(2 outcomes)
orange-blue-grey(2 outcomes)
If I miss understood the question please let me know so I can correct myself.
We can say that the money in his bank account is represented by x and the total amount of money in his bank account is y. If we take the money in his account and subtract it by 45, it will equal the total amount of money in the bank account. In other words,
Y = X-45
With two dice, you can get sums of between 2 and 12,
The answer to your question should be b