Solve
-When Making a Telephone Call Using a Calling Card $\$ 2.90$

Multiple Choice

Solve.
-When making a telephone call using a calling card, a call lasting 6 minutes cost $\$ 2.90$ . A call lasting 15 minutes cost $\$ 6.50$ . Let $y$ be the cost of making a call lasting $x$ minutes using a calling card. Write a linear equation that models the cost of a making a call lasting $x$ minutes.

A) $\mathrm { y } = 0.4 \mathrm { x } + 0.5$
B) $y = \frac { 5 } { 2 } x - \frac { 121 } { 10 }$
C) $\mathrm { y } = - 0.4 \mathrm { x } + 5.3$
D) $y = 0.4 x - 8.5$