Can you guys me with 11 a.) and 11 b.)

(a) $8.70     (b) $17.40

Step-by-step explanation:

Use the information provided to create a system of equations.  Then solve the system using any method (I will be using the elimination method) to find the cost of each individual item.

Let y represent the cost of a yogurt and s represent the cost of a sandwich.

Jolly:      2y + 1s = $12.60 --> 1(2y + 1s = $12.60) -->   2y + 1s =  12.60

Special: 1y + 2s = $13.50 -->-2(1y + 2s = $13.50) --> -2y - 4s = -27.00

                                                                                           -3s = -14.40

                                                                                          ÷ -3     ÷ -3  

                                                                                               s = 4.80

Input the s-value into either of the equations to solve for "y"

Special: y + 2(4.80) = 13.50

             y  +  9.60   = 13.50

             y                 =  3.90

Input both the s and y-values into the Children's Meal and Family Meal to find their costs:

Children's: 1y + 1s                             Family: 3y + 2s

              =  (3.90) + (4.80)                          = 3(3.90) + 2(4.80)

              =         8.70                                   =   7.80   +   9.60

                                                                    =          17.40

answer: my brother can figure it out, imma go get him so i can answer : ) edit: my brother is sleeping, sorry man

step-by-step explanation: