SOLUTION: Please help me solve this problem. In Michigan, speeding fines are determined by the formula: F = 10(x – 65) + 50 were F is the cost, in dollars, of the fine if a person i

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Question 180724: Please help me solve this problem.
In Michigan, speeding fines are determined by the formula: F = 10(x – 65) + 50 were
F is the cost, in dollars, of the fine if a person is caught driving x miles per hour. If the fine comes to $400, how fast was that person speeding?

Answer by vleith(2983) About Me  (Show Source):
You can put this solution on YOUR website!
F = 10(x – 65) + 50 you are asked to find x for a given F
F = 10(x – 65) + 50
400+=+10%28x+-+65%29+%2B+50
400+=+10x+-+650+%2B+50
400+=+10x+-+600
1000+=+10x
100+=+x
The person was driving 100mph. One can only hope they were at the Michigan MotorSpeedway in a warm up lap.