Real-world problems do not often present themselves in mathematical terms. The mathematics often has to be inferred from the context of the sentence.

A rock climber is climbing a rock at Hueco Tanks State Park outside of El Paso, Texas. The altitude of the rock climber can be found using the equation *a* = 4,600 + 200*h*, where *h* represents the number of hours climbed, and *a* represents the climber's altitude above mean sea level.

Click and drag the part of the equation to the statement that best describes that part.

A rock shop sells souvenirs of special types of rocks. They sell granite, marble, and sandstone. The pricing manager uses the equation 16*g* + 4*s* = 24 to determine the amount of granite and sandstone that should be included in each rock bag, which costs $24.

Click and drag the part of the equation to the statement that best describes that part.

**Practice**

Which of the following scenarios could be used to describe the equation *c* = 3.75*s* + 15?

- The total cost of a stock transaction is $3.75 per share of stock, plus a $15 fee.
- The total cost of a vehicle with s passengers to enter the state park is $18.75.
- The total cost for
*s*concert tickets is $15 per ticket, plus a convenience fee of $3.75. - An international telephone call that lasts s minutes costs a total of $3.75 per minute, plus a $15 connection fee.

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In the equation, the constant term may represent a fixed fee, and the coefficient of theWhich of the following scenarios could be used to describe the equation 4*x* + 6*y* = 20?

- A snack bag contains caramel popcorn that costs $4 per pound and cashews that cost $6 per pound. The snack bag costs $20.
- Adult tickets cost $6 each and children's tickets cost $4 each. Mrs. Merriwether purchased $20 worth of tickets.
- Hamburger and french fry combo meals cost $10 each. Jonathan purchased $20 worth of combo meals.
- Sybil works at a snack bar. Jellybeans cost $4 per pound and sesame sticks cost $6 per pound. Last week, Sybil worked 20 hours.