Question

Every week, Mills buys bagels and donuts at a bakery. Last week, she bought 4 bagels and 3 donuts for 5.55. this week she bought 5 bagels and 5 donuts for 8.00. The system of equations that represents this situation can be expressed using the equation below: [4 5] [x] = [5.55]

[5 5] [y] = [8.00]
what is the cost of each donut

Answer 1

$1.20

Explanation:

let bagel = B

let dougnut = D

4 B + 3 D = 5.55 — (1)

5 B + 5 D = 8.00 — (2)

[make B the same — common multiple]

20 B + 15 D = 27. 75 — (3)

20 B + 25 D = 40 — (4)

[subtract]

10 D = 12.25

D = 1.225

≈ $1.20 (3 s.f.)