Problema Solution
A vendor has learned that, by pricing pretzels at $1.75, sales will reach 119 pretzels per day. Raising the price to $2.75 will cause the sales to fall to 79 pretzels per day. Let y be the number of pretzels the vendor sells at x dollars each. Write a linear equation that models the number of pretzels sold per day when the price is x dollars each.
Answer provided by our tutors
A vendor has learned that, by pricing pretzels at $1.75, sales will reach 119 pretzels per day. Raising the price to $2.75 will cause the sales to fall to 79 pretzels per day. Let y be the number of pretzels the vendor sells at x dollars each. Write a linear equation that models the number of pretzels sold per day when the price is x dollars each.
Solutio:
y=Ax+B
119=1.75A+B
79=2.75A+B
So
A=-40
B=189
So the equation is y=-40x+189