Question

10. A girl bought 2 rotis and 3 pies for $10.00.1
she had bought 5 rotis and 2 pies she would
have paid $19.50.
(a) Write two equations to represent the infor-
mation given above.
(b) Calculate the cost per roti.
(c) Determine the cost per pie,

Answer 1

Answer:

roti = $3.50  pie = $1.00

Step-by-step explanation:

2r+3p = 10     5r+2p = 19.50.      we multiply the whole equation starting with 3p x 2   and 2p x 3   =6p on each equation  4r+6p = 20  then multiply the sae line by either the 2 or the 3 and 15r +6p = 58.50  and when we have add showing each equation to minus + eliminate 6p - 6p = 0  then find  = 11r = 38.50  then divide to find r  =  38.50/11  to show r = 3.5           We then need to find p so use either the original equation to find 5(3.5)+ 2p = 19.50   = 17.5 + 2p = 19.50   = 2p = 19.50 -17.50 =  2p = 2 to show p= 2/2 and p = 1