Can someone please help me with this and if able to explain how I work it out please

Solve 2x+y=3 x+y=5 in substitution method

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.

Complete the solution of the equation. find the value of y when x equals to 6 4x+y=20