Big Ideas Math Integrated I, 2016
BI
Big Ideas Math Integrated I, 2016 View details
1-3. Quiz
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Exercise 19 Page 26

Practice makes perfect
a To find after how many hours the cost of the studios will be the same, we need to write an equation for the cost of each studio and then set them equal to one another. Studio A has a flat fee of $10 for the vase and then costs $8 per hour h.
A=10+8h Studio B has a flat fee of $16 for the vase and then costs $6 per hour h. B=16+6h Now we can find when the costs at Studio A equal the costs at Studio B.

A=B
10+8h= 16+6h
8h=6+6h
2h=6
h=3

The total cost is the same at both studios if we paint for 3 hours.

b Let's suppose that Studio B increases their price by $2 per hour. This would change the equation for the total cost.
B=16+8h Let's set the equations equal to one another again and solve to see what happens.

A=B
10+8h= 16+8h
8h=6+8h
0≠ 6

There is no solution. This makes sense if we think about it even without using equations. The vase costs $6 more at Studio B than at Studio A. If the hourly rates are the exact same, Studio B will always be more expensive.