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 Question from Raven: I have to create a scenario for the following equation y=-1x+45 and then find what each part of the equation represents

Hi Raven,

The manager of a local Tim Horton's gave Raven a number of coupons, each one for a free coffee. Raven uses one coupon per day. Write an expression for $y,$ the number of coupons she has left after $x$ days.