Determine the value of parameter a, for which the system of equations 3x + 2ay = 1 and (3a - 1)x - ay = 1 has a soulution in the domain of integer
numbers.

I didn't know I am so sorry

Step-by-step explanation:

He estimated that he had about $9 worth of groceries

Step-by-step explanation:

Given that

Gallon of milk =  $3.49

Three pounds of  oranges = $1.14(3) = $3.42

Box of cereal =  $3.46

Here the front end estimation should be applied that means only considered the number that shows in the front side and the remaining numbers should be zeros

Now applying the front end estimation, It shows like this

$3.49 => $3.00

$3.42 => $3.00

$3.46 => $3.00

Now sum of all 3 that comes 9

Therefore the second option is correct