The slope is the coefficient of the variable. In this case, -1/4 is before the x. So the answer is C
I believe this a reduction
The amount of income you anticipate having
let the original price be x.
then,
x- 25% of x= 24
x- 25x/100 = 24
x- x/4=24
3x/4=24
3x= 96
x= 32
in short...the original price= 32 dollars