Renata wins a $20 gift card to an online music site. After Renata purchases 16 songs, the gift card has a remaining
balance of $0. Which equation represents the relationship between y, the remaining balance on Renata's gift card,
and x, the number of songs purchased?
4x + 5y = -100
5x + 4y = 80
4x + 5y = 16
5x + 4y = 20

4444444444444 i think

answer4 to the second power is 16

and 4 to the third power is 64,

the image is given below

since the options are not given so we draw it from the equation

the given equation is

y = (x-1) (x+4)

y = y² + 3x - 4

the above equation is a quadratic equation which will have two roots. if we draw the graph for it, it will look like this