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Go to: Linear Equations and Linear Systems in the Real World.
Use the first three tables to study Jose, Marcus, and Samantha's situations.
Jose: Started saving with $50 and continued to save $10 per month.
Marcus: Started saving with $0 and continued to save $15 per month.
Samantha: Started saving with $75 and continued to save $5 per month.
Is it reasonable to conclude that Jose and Samantha will have saved the same amount of money after five months?
Is it reasonable to conclude that Samantha and Marcus will have saved the same amount of money after five months?
After how many months, if any, will all three have the same amount of money saved?

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Jose and Samantha will have saved the same amount of money ($100) after 5 months. Yes, the conclusion is reasonable.
Samantha and Marcus will have saved the same amount of money ($112.50) after 7.5 months. No, the conclusion is not reasonable.
The three will never have saved the same amount of money at the same time.