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Phone Company A charges a monthly fee of ${\$39.40}$ , and ${\$0.04}$ for each minute of talk time.

Phone Company B charges a monthly fee of ${\$35.00}$ , and ${\$0.06}$ for each minute of talk time.

Write and solve a system equation to answer the following questions.

These two companies would charge the same amount on a monthly bill when the talk time was minutes.