y = 12 + 10x....let me re-arrange this
y = 10x + 12....in y = mx + b form (which is what this is in now), the slope will be in the m position.
y = mx + b
y = 10x + 12
as u can see, the number in the m position is 10. So u have a slope of 10.
The slope would represent how much ur adding to ur wallet each week. U are adding $ 10 dollars for (x) weeks.