I need help on this question this is what i need help with

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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.

Solve 3x-18=2y and 5x-6y=6 by elimination show work

If the simple annual interest rate on a loan is 6, what is the interest rate in percentage per month?