Question

Jenna buys 12 lb of meat. Some of the meat is chicken and costs $1.90/lb. The rest is beef, which costs $4.30/lb. She spends a total of $34.80.

Which equation models this situation?

Let c represent the number of pounds of chicken she buys.


A.
(1.9 + 4.3)(12 – c) = 34.8

B.
4.3c + 1.9(c + 14) = 34.8

C.
4.3c + 1.9(12) = 34.8

D.
1.9c + 4.3(12 − c) = 34.8

Answer 1

well the cost equation is

1.9c + 4.3b = 34.80

the weight equation is

c + b = 12

so making b the subject

b = 12 - c

now substitute this into the cost equation at the top so you can get the
correct answer

hope it helps

Answer 2

thx

Answer 3

wait i dont understand.

Answer 4

@campbell_st

Answer 5

ok... so the cost equation of the chicken (c) and beef (b) is

1.9c + 4.3b = 38.40

the weight of the beef is b = 12 - c

so substituting this value of b into the cost equation, will all you to have the total cost in terms of chicken(c)

1.9c + 4.3(12 - c) = 34.80

if necessary you could then calculate how much chicken you bought.

hope it makes sense