The answer you are looking for is "A Constant Slope",.
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Let us say the original price of taco before tip was x dollars.
Percentage of tip given =25 %
Amount of tip given = $2
Now we can say that 25 % of total amount = 2 dollars.
Making an equation,

Now we have to solve for x, so dividing both sides by 0.25,
x= 8
Answer : The original price of tacos before tip was $8.
Step-by-step explanation:






Using the formula
L=rx (x=angle)
x=L/r
x=8/3
x=2.6 radians