SOLUTION: how do I solve this problem by method of addition and substitution: A toll bridge costs $2. If you use the bridge x times in a month, the monthly cost , y is y=2x. With a $10 co

Question 535696: how do I solve this problem by method of addition and substitution:
A toll bridge costs $2. If you use the bridge x times in a month, the monthly cost , y is y=2x. With a $10 coupon book the toll is redueced $1. The monthly cost, y, of using coupon book is y=x+10. How many times do use the bridge without the coupon book to to equal the cost with the coupon book.

Answer by Earlsdon(6294) (Show Source): You can put this solution on YOUR website!
You have the cost equations for both situations, so set these two equations equal to each other and solve for x.
and
Set these equal.
Solve for x. Subtract x from both sides.

The monthly cost, y, will be the same if you use the bridge 10 times.

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