Help a friend out plz

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.

How do i make someone brainliest? (if you answer me, i might be able to make you brainliest! )

X+y=-4 x-y=2 use elimination with adding and subtraction