SOLUTION: Your friends are visiting family in Chicago. In 5 hours they were 250 miles closer to to their destination (they were traveling at a speed of 50mph) Equation: y= -50x+500 How lo

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Question 713874: Your friends are visiting family in Chicago. In 5 hours they were 250 miles closer to to their destination (they were traveling at a speed of 50mph)
Equation: y= -50x+500
How long does it take to travel 112.5 miles?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
+y+ in the equation is how far from their
destination they are.
Initially, +x+=+0+ and they are +500+ miles away
They will have traveled +112.5+ miles when they
are +500+-+112.5+=+387.5+ miles from their
destination, so I can say
+387.5+=+-50x+%2B+500+
+-50x+=+-500+%2B+387.5+
+50x+=+112.5+
+x+=+2.25+
It will take them 2 hrs and 15 min to travel 112.5 mi