Let x be the number of miles driven. For the first plan, the cost is $75 + $0.30x. For the second plan, the cost is $0.80x. Set the two costs equal to find when they are the same:
$75 + $0.30x = $0.80x
Subtract $0.30x from both sides:
$75 = $0.50x
Divide both sides by $0.50:
x = 150
Miguel would need to drive 150 miles for the two plans to cost the same.
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