Algebra - Ch. 32: Applications of Linear Equations (2 of 11) Depreciation: Example 1

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We will solve: A printing press costs $55,000 new. The depreciation is $5000 per year. How long can you keep the printing press if you want to see it when the salvage value is $20,000? Ex. 1

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[rickshafer]

That y=mx+b formula is terrific.
Most of you could do this in your head.
But to see it. This is all algebra is.
And the point-slope. The y vertical is the variable. Slope always is times 'x'. (horizontal). b is were the line crosses the y axis. In any li ear equation the constant is where the line crosses the y axis. So 55 -20 ÷5 = 7.

[aliso-pvll]

Doc B, this problem is depressing. Great lesson, thanks!

[tseckwr]

Professor van Biezen ... thanks again for another solution video. I do have a question. Isn't m (slope) simply "value lost per year" without the word TIME in the denominator because it already contains time in the denominator "per year"? (value lost / year). Just asking ...