Write an equation for the linear function and use it to answer the given question.
-You can rent time on computers at the local copy center for a $7 setup charge and an additional $4 for every 5 minutes. How much time can you rent for $16?
A) $\mathrm { r } = 7 + 0.8 \mathrm { t } ; 11.25$ minutes
B) $r = 7 t + 0.8 ; 2.17$ minutes
C) $\mathrm { r } = 7 \mathrm { t } - 0.8 ; 2.4$ minutes
D) $\mathrm { r } = 7 - 0.8 \mathrm { t } ; 28.75$ minutes

Question

Write an equation for the linear function and use it to answer the given question.
-You can rent time on computers at the local copy center for a $7 setup charge and an additional $4 for every 5 minutes. How much time can you rent for $16? 
A) $\mathrm { r } = 7 + 0.8 \mathrm { t } ; 11.25$ minutes
B) $r = 7 t + 0.8 ; 2.17$ minutes
C) $\mathrm { r } = 7 \mathrm { t } - 0.8 ; 2.4$ minutes
D) $\mathrm { r } = 7 - 0.8 \mathrm { t } ; 28.75$ minutes

Quizplus · Accepted Answer

The cost of renting time on computers is $7 plus $0.8 per minute (since $4 for every 5 minutes equals $0.8 per minute). For $16, the equation $r = 7 + 0.8t$ can be used to solve for $t$, giving 11.25 minutes.

Write an Equation for the Linear Function and Use It r=7+0.8t;11.25\mathrm { r } = 7 + 0.8 \mathrm { t } ; 11.25r=7+0.8t;11.25

Write an Equation for the Linear Function and Use It $\mathrm { r } = 7 + 0.8 \mathrm { t } ; 11.25$