Question

in a fastfood chain, four cheeseburger and two large drinks cost 180. 2 large drinks cost 5 more than a cheeseburger. what is the cost of the cheeseburger? the drink?

Answer 1

C= # of cheesburgers
D=# of drinks

4C+2D=180
2D=C+5 --> rearrange: C=2D-5

plug one equation into the other:
4(2D-5)+2D=180
8D-20+2D=180
10D-20=180
add 20 to both sides:
10D=200

divide both sides by 10
D=20

plug back into the original equation:
C=2D-5
C=2(20)-5
C=40-5
C=35

The cheeseburger costs 35 while the drink costs 20.

Answer 2

thank you