Problem 4.1: Write an equation for the vertical line that passes through (2, 4). [Solution]

Problem 4.2: Write an equation for the graph of the following line:
[Solution]

Problem 4.3: Write an equation for the horizontal line that passes through (- 12, 18). [Solution]

Problem 4.4: Write an equation for the graph of the following line:
[Solution]

Problem 4.5: Match each equation with its corresponding graph.

a) y = 3
b) y = 3x
c) x = 3
d) x = 3y [Solution]