A bank account is opened with an initial deposit of $450. Every week, $22.50 is withdrawn from the account. a) Write an equation in the y=mx+b form, relating the account balance to the number of weeks. State the meaning of each variable in your equation (what do x and y represent?) After that use your equation (solve) to calculate the account balance after 13 weeks. Finally use your equation (solve) to calculate when (in how many weeks) the account balance will be $270.

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