I need all the answers please help me

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.

3x + 4y = 5 x- 3y = -7 solve by substitution

Find all the angles that satisfy the equation cos(θ)=32