Madison and Allison go out to a local taco restaurant for lunch. Madison orders three soft tacos and three mini burritos and charges $15.75 on to her credit card. Allison pays $17 for her order of four soft tacos and two mini burritos. What is the cost of one soft taco and one mini burrito?

graph #4 (last graph) depict the function   f(x)= -m(x-d)^1/5 i

step-by-step explanation:

we know that

m=slope

but in this function slope is -m that means slope is decreasing and it is decreasing by 1/5 points down the x-axis.

which is shown in graph four

a decreasing slope down x-axis by 1/5 points.

hence 4th graph is the right option for this.