Problem C30 p. 18

Find all the solutions to the linear system:

System of uqations:

\[x + y = 5\]
\[2x − y = 3\]

Step 1:

Solve both equations for y

\[y = 5 - x\]
\[y = 2x - 3\]

Step 2:

Make them equal and solve for x

\[2x - 3 = 5 - x\]
\[3x = 8\]
\[x = \frac{8}{3}\]

Step 3:

Plug x into any one of the orginial equations and solve for y

\[\frac{8}{3} + y = 5\]
\[y = 5 - \frac{8}{3}\]
\[y = \frac{7}{3}\]

The solution set for this system of equations is \[x = \frac{8}{3}\] and \[y = \frac{7}{3}\]