A $1080 washing machine in a laundromat is depreciated for tax purposes at a rate of $90 per year. Find a function for the depreciated value of the washing machine as it varies with time. When does the depreciated value reach $0?

The equation of the line in slope-intercept form is v=____

(answer in slope-intercept form. Also, must use have expression using t as the variable. No symbol is needed/recommended in the solution