Please help ASAP!! I can’t seem to figure it out

For the equation below, x is the input and y is the output. y = -4x + 3 if the input is -8, then the output is

Marco has $38.43 dollars in his checking account. his checking account is linked to his amazon music account so he can buy music. the songs he purchases cost $1.29. part 1: write an expression to describe the amount of money in his checking account in relationship to the number of songs he purchases. part 2: describe what the variable represents in this situation.

Which of the following best describes the delian problem?