Find the constant of variation k for the direct variation. x f ( x ) 0 0 3 6 4 8 7 14 a.) k = –2 b.) k = 0.5 c.) k = 2.5 d.) k = 2

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.