How can I graph 1/4x+y=3?

Which values for a and b will create infinitely many solutions for this system of equations? ax-y=8 2x+y=b

Any is very appreciated! (picture is provided below)not sure how to do this at all won't lie

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.