Ivan is a door to door vacuum salesman. His weekly salary S(v)\displaystyle {S}{\left({v}\right)}S(v) is given by the linear function S(v)=450+145v\displaystyle {S}{\left({v}\right)}={450}+{145}{v}S(v)=450+145v, where v\displaystyle {v}v is the number of vacuums sold. Identify the slope, and explain the meaning of the slope.
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