Please help with this math question attached

The answer to your question is $6 per joop, $9 per pib

Step-by-step explanation:

Data

Equation l          5x + 4y = 66

Equation ll         3x + 6y = 72

Process

1.- Multiply equation l by 3 and equation ll by -5

                        15x + 12y = 198

                        -15x - 30y = -360

- Simplify

                           0 - 18y = -162

- Solve for y

                                    y = -162/-18

                                    y = 9

2.- Substitute y in Equation l

                           5x + 4(9) = 66

                           5x + 36 = 66

                           5x = 66 - 36

                           5x = 30

-Solve for x

                             x = 30/5

                             x = 6

walter needs to make at least 5 more cookies but no more than 40. 5 ≤ x ≤ 40

step-by-step explanation:

20 ≤ x + 15 ≤ 55

subtract 15 from all parts

20-15 ≤ x + 15-15 ≤ 55-15

5 ≤ x ≤ 40

this means how many more cookies he has to make

walter needs to make at least 5 more cookies, but no more than 40 cookies; 5 ≤ x ≤ 40