Linear systems by substitution (SAT) practice

$\begin{cases} y = -x + 8 \ 4x + y = 14 \end{cases}$
The solution to this system is $(x, y)$. What is the value of $x + y$?

At a cafe, a cup of coffee costs $\text{\char36}c$ and a cup of tea costs $\text{\char36}t$. A cup of coffee costs $\text{\char36}2$ more than a cup of tea. One cup of tea and two cups of coffee cost $\text{\char36}16$ in total. What is the price of one cup of coffee?

A rental shop charges $\text{\char36}b$ per hour to rent a bike and $\text{\char36}s$ per hour to rent a scooter. The scooter rental costs $\text{\char36}3$ more per hour than the bike rental. Renting one bike for $2$ hours and one scooter for $1$ hour costs $\text{\char36}18$ in total. What is the hourly rate to rent a bike?

A museum sells student tickets for $\text{\char36}s$ each and adult tickets for $\text{\char36}a$ each. An adult ticket costs $\text{\char36}7$ more than a student ticket. One adult ticket and two student tickets cost $\text{\char36}28$ in total. What is the price of one student ticket?

A parking garage charges $\text{\char36}h$ for one hour of parking and $\text{\char36}d$ for a daily pass. A daily pass costs $4$ times as much as one hour of parking. Buying one hour of parking and one daily pass costs $\text{\char36}15$ in total. What is the price of a daily pass?

$\begin{cases} y = 2x + 3 \ 3x + 2y = 27 \end{cases}$
The solution to this system is $(x, y)$. What is the value of $y$?

$\begin{cases} p = q + 5 \ 3p + 2q = 40 \end{cases}$
The solution to this system is $(p, q)$. What is the value of $q$?

At a snack bar, a bag of chips costs $\text{\char36}c$ and a candy bar costs $\text{\char36}d$. A candy bar costs twice as much as a bag of chips. Buying $3$ bags of chips and $2$ candy bars costs $\text{\char36}21$ in total. What is the price of one candy bar?