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#### notgoodatmath

##### New member

- Nov 23, 2013

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Question: Keller industries' profits were up $ 20,000 this year over last year. This was an increase of 25%.

**a. Let T represent the profit this year and L the profit from last year and write a system of equations that can be used to determine the profits.**

**b. Which method would be most efficient to solve this system (addition method or substitution method)? Explain**

c.Using your system to determine the profit for this year and last year.

Two pieces of information are given:

∙ This year's profit is $20000 more than last year's profit.

∙ The increase is 25%.

You should write both in equation form. Then you get a system of two equations with two variables, which you can solve.

But how do i write the equations?

I have a few thoughts.