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Algebra

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Need some Homework help for my son and I am not doing so great figuring out the correct answer- all explanations a greatly appreciated..... he has the following 3 part word problem.
Josh mows lawns after school and earns $25 for each lawn mowed.
1. write a direct variation equation that relates the number of lawns Josh mows with the total amount of money he earns
2. What is the constant variation?
3. Josh earns an extra $15 for weeding a neighbors garden. The total amount of money (a) Josh makes with this extra $15 can be modeled by a=25L + 15. Is this a direct variation equation? Explain
Thanks!

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