What is the cost of milk?

Question

At a restaurant the cost for a breakfast taco and a small glass of milk is $2.10. the cost for 2 tacos and 3 small glasses of milk is $5.15. What is the cost of milk?

Answer 1

T+M =2.10

2T + 3M = 5.15

2T+2M =4.20

subtract to get

M = 95 cents

T=2.10 - .95 = $1.15 for one taco

Answer 2

1) t + m = 2.10

2) 2t + 3m = 5.15

3) 2t + 2m + 4.20 multiply 1) by 2

4) m = 0.95 subtract 3) from 2)

What is the cost of a taco?