‼️ HELP PLEASE ‼️
Will mark brainliest.

Look at the following graph of the given equation. determine whether the equation is a function. explain why or why not.

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.

Combine like terms to make a simpler expression 3z+z